Evidence suggests his ~1 million BTC were mined into throwaway addresses:
https://bitscan.com/articles/satoshis-millions-gone-for-good

[EDIT:Hint #1:]

A while back I posted a pilot and episode 1 of a bitcoin puzzle game. Here is the 2nd episode:

http://bitscan.com/articles/the-hidden-keys-game-the-mystery-deepens

You can find out more information about the previous episodes (which might be useful) on that page.

It would be good to keep this thread for feedback and updates, though if you win it you might want to limit what you give away, since it may become important again in the future...

Enjoy!

EDIT:
Hint #1: Although the email mentions other books, the weird style convinces me that any hidden message is in the text he sent me itself. There are inconsistencies I have spotted, but I'm still not sure where to start...

Sorry, there's no bounty for this - hope this is the right place.
Someone just sent me 0.002 bitcoins from this address: 1E75aBtdS6X4pDFoaxYXEkzvFMaEdPDmKe
They've done this periodically to other addresses recently. Addresses they've sent to include Pirate Bay and the Bitcoin Foundation: https://blockchain.info/address/1E75aBtdS6X4pDFoaxYXEkzvFMaEdPDmKe Sometimes the same amount, sometimes different.
Any ideas what that's about?!

I earn part of my income in bitcoins and live in the UK, which means I get spanked by the banks when I try to withdraw from Stamp. There are currently no worthwhile UK exchanges.
Sites like Bittylicious and Bitbargain typically sell for Stamp +5-15% but you need to sell a certain amount of coins per month to qualify and I'm not sure I have the time or inclination to sit around waiting for a buyer to appear and money to land in my account.
I'd like to find a trustworthy UK partner who I can sell bitcoins to (probably anything from a few hundred to a couple of thousand USD worth a month) and have them sell them on via one of these services. I'd be willing to split the premium over Stamp, or accept a certain agreed rate if you prefer.
You'll need to be:
Based in the UK or have a UK bank account
Be willing to buy smallish amounts of bitcoin from me from time to time
Be trustworthy. Obviously, this point is really important. Ideally you'll have Trust on this forum and be a long-term member, or be able to demonstrate trust elsewhere.
If you happen to run one of these services or similar, so much the better.

[Ethos]

I've worked as a copywriter for over 10 years on a huge range of different projects, from books and white papers to film scripts, blog posts and web articles. Since learning about Bitcoin I've written literally tens of thousands of words on various aspects of the ecosystem: exchanges and trading, mining, economics, reviews of services, wallets and storage, and much more.

I've recently become involved with BTCD and the SuperNET project, writing white papers, ICO docs and articles. I write regularly for a number of different websites.

You can see further examples of my work here:
http://bitscan.com/articles/the-curious-picture-of-bitcoin-in-the-uk
http://bitscan.com/articles/amazon-was-a-bubble-too
For something a bit different, http://bitscan.com/articles/mystery-bitcoin-game-the-hidden-keys
For scriptwriting, take a look at these short films for NXT.
I can point you to plenty more samples, should you need them.

I live in the UK and much of my work is based here, but Bitcoin has no respect for borders and I've found it an excellent way to tap into different markets around the world. If you'd like to discuss a project, please PM me.

Ethos
One-off projects are fine, but longer-term working relationships benefit both parties.
There are plenty of writers offering cheap articles, both on these boards and around the web. If your decision is based on cost alone and you don't care about quality, originality, accuracy or punctuality, one of these will be able to serve your needs far better than me.
I aim to produce the content you need first time. Within reason, though, I'll rewrite if it's not what you expected - that's just part of a good working relationship. I'm happy working independently and coming up with ideas, but if you've got something specific in mind then the more information you can give me the better.

Rates
I'd typically charge £25/$40 per hour, BTC equivalent, or per standard article (500-600 words). Lower rates can be negotiated, but that usually reflects a long-term collaboration, familiarity with the subject matter, fast payment, and a high level of trust.
For projects that require extensive research or have a particularly demanding spec or style, I charge significantly more.
For large projects I prefer piecemeal payment.

Topics
I'll write on most subjects, but for various reasons I can't/won't write about the following: adult, gambling, payday loans, online pharmacies or those miracle drugs...

[UPDATE]

Here's a new episode to the puzzle game I piloted a couple of weeks back:
http://bitscan.com/articles/missing-keys-the-mystery-continues

Those clues were guessed pretty fast so hopefully this one will take a little longer. This is the first of three related episodes, to be released over the next month or so.

Original episode (for background) here: bitscan.com/articles/mystery-bitcoin-game-the-hidden-keys

UPDATE: hints available at http://bitscan.com/articles/missing-keys-clue-hints-revealed

[UPDATE]

http://bitscan.com/articles/mystery-bitcoin-game-the-hidden-keys

UPDATE: hints/solutions for clues can be found at http://bitscan.com/articles/mystery-bitcoin-game-the-clues-are-revealed

The address to find the key for is 18iD8nnxmYSDbMBvgfFzE9D7fgUdchpdUD

Update 7/4/14:
"Knowing my uncle's interest in early North American people groups and their languages, I'm guessing that Bridge River Rapids is SETL."

"I'm pretty sure that Roman numerals feature in a few places here, including LIV."

The missing keys
This is a pilot for a new puzzle game. It would be great to get some discussion going over clues and how to improve it.
Answers to clues will be released regularly, until someone guesses the private key and sweeps the prize! If it's successful, future episodes will have larger prizes.

"My uncle was a polymath whose interests encompassed everything from science and maths to ancient languages and chess. In the early stages of bitcoin he became intrigued by the idea of cryptocurrency, and had the foresight to start mining while it was still possible with an ordinary desktop computer. Fanatical about security, he never trusted either hot wallets or cold storage. Instead, he relied on his remarkable memory and simply stored his private keys in his mind.

"When he disappeared, suddenly and without warning at the end of last year, no one knew what to make of it. As the months wore on my family reluctantly came to the conclusion that something had happened to him and he was gone for good. The police were unable to shed any light on it, and since no crime had apparently been committed they told us there was little more they could do. Though I struggled to believe he was dead, this seemed the most likely answer. Nothing in his London flat had been moved, none of his personal effects had been taken. To all appearances he had walked out one day and never returned. The only thing missing was a body...."

Find out more:
http://bitscan.com/articles/mystery-bitcoin-game-the-hidden-keys

Other people seem to have had similar problems, but not sure if they're exactly the same - or if it's related to the recent outage.
I received this transaction https://blockchain.info/tx/bc1ba3541c6753b5643b5624eac15ef0b46ae80e8f6c5ad618bb24e922f45497 earlier today, and almost immediately transferred the funds (slightly more) out to Bitstamp. The two transactions happened at 18:42 and 18:49. Now, nearly two hours later, neither is showing a single confirmation. I'm using blockchain.info and did pay 0.0001 btc in transaction fees.
Related may be that 1SochiWwFFySPjQoi2biVftXn8NRPCSQC felt the need to send me 1 satoshi earlier in the day, which hasn't confirmed either.
Any ideas?

Simple question, possibly a complicated answer. One for the economists?
Bitcoin's "market cap" is currently around $8 billion = $640/btc x 12.5 million btc in existence.
However, this does NOT mean that $8 billion has been poured into bitcoin. Almost all were purchased at lower prices (or mined). Many coins were bought at a very low price. As more were bought, the price rose, to where it is now. Basic supply and demand.
My question is: roughly what is the total amount of money that was spent in pushing the price up to where it is now? I imagine there's some sort of exponential graph or a standard model that illustrates this, but I've no idea what it would be.
I think this is relevant because it gives an indication of how much the price would rise given further investment, or how much it would fall when people sold.
That would give a much better metric of long-term prospects than I've seen just about anywhere else. It might allow us to say, If xx corporate investor came on board with $yy million, where would the price go?
Or we could just keep talking about the magic train that's going to take us to the moon...

http://bitscan.com/bitnews/item/amazon-was-a-bubble-too

[a lot]

http://bitscan.com/bitnews/item/how-many-people-really-own-bitcoins-and-why-does-it-matter argues 500,000 - probably a lot fewer because a lot of people have 5, 10+ addresses?

I'm looking to create a system where bitcoins are paid to a given address automatically when the right payment conditions are met.
Any ideas on good ways of doing that?

Wrote an article for BitScan about what might happen to bitcoin in 2014: http://bitscan.com/bitnews/item/bitcoin-predictions-for-2014
Feedback welcome (including criticism), and any other possibilities I've missed.
Thanks!

Not a lot of good options in the UK, especially for selling.
http://bitscan.com/bitnews/item/britcoin-where-and-how-do-you-buy-bitcoin-in-the-uk has most of the ones I know of for buying. Any other ideas, particularly for selling?
Also, has eBay just made it easier or harder to buy/sell BTC? Can't make sense of their new policy, whether they're trying to clamp down, open up or just clarify.

There's a page here: https://bitcointalk.org/index.php?topic=103939.0 about generating all-caps private keys for stamping on metal blocks for cold storage (nice idea). A mini private key would be easier, and it would be simple to generate an all-caps mini key. However it would be cryptographically weaker. The question is, how much weaker and would it be weak enough to be a bad idea?