Everybody should post to his social network of choice that he will give away 1 Bitcoin divided among any of his friends who ask for it - to encourage people to figure out what Bitcoin is.

I suggest we do this the next Friday, August 10. Spread the word please.

Handcrafted box for making 3,5inch Harddisks silent.
The box itself is a 5.25inch CD-drive case so you can mount it into standard ATX PC cases.

It was over 2 hours work to create this from a used CD drive and bitumen sheets.
The sheets cost over 20 EUR, so the starting price of 45 EUR is very cheap.

As far as I remember, bitumen is a good heat-conductor so the harddisks will not heat up too much.
Its noise damping property is also good
The bitumen sheets which were used are special sheets for being used in such things so they do not stink like the bitumen you know from streets does.

Notice that I offer a second one in my other auctions.

https://www.bitmit.net/de/trade/i/4483-handcrafted-bitumen-harddisk-noise-attenuation-box/description

FYI: I did an hour of "Is this Twitter account for an Individual? Job 1". Used all browser hotkeys possible to get it done as fast as possible.
Then computed the hourly payment, taking into account the current Bitcoin value: I ended up with a wage of ~ 1 EUR/hour (~= 1.3 $/hour).

Considering the complexity of "Categorize Twitter Users Based On Their Primary Occupation (New task + More Countries + Better Pay!)", I think the wage might end up at roughly 0,2 EUR  per hour.
Even for low-skilled work like this is, thats unacceptable 
Just to give you a hint why all other jobs are empty already but this one still got >5000 points available.

This thread is still in the top 3 google search results for "donate bitcoin button" so IMHO it should be filled with useful information 

I tried to figure out what the most portable Javascript way of doing a "Donate" button this is and wrote an article about it, here you go:
http://leo.bogert.de/2012/02/22/simple-bitcoin-donate-button/

The code which can be copied directly from my article into your HTML should work with any browser: It uses no 3rd party libraries, and no fancy modern JS functions.

While it does not fully wire in to the Bitcoin-client, it is IMHO currently the only solution which will work for almost everyone.
The Bitcoin client which supports the bitcoin:// address format might not be widespread enough to use it yet.
Also, I remember from development of other apps which use custom addresses that its quite difficult to get the protocol registration working for all browsers which a user has installed.

I'm aware that it is not fully what was requested here. HOWEVER sometimes the most simple solutions are the best IMHO. So I'll just try to claim the bounty and see what happens

I tried to figure out what the most portable Javascript way of doing this is and wrote an article about it, here you go:
http://leo.bogert.de/2012/02/22/simple-bitcoin-donate-button/

I tried to figure out what the most portable Javascript way of doing this is and wrote an article about it, here you go:
http://leo.bogert.de/2012/02/22/simple-bitcoin-donate-button/

Someone pointed out that there is a proposal for Bitcoin URIs:
https://en.bitcoin.it/wiki/BIP_0021

However I don't know whether it is possible to check w/ Javascript whether the browser can eat bitcoin URIs.
If that was possible then my mechanism could be implemented as fallback.
If it is not possible then bitcoin URIs should not be used until the Bitcoin client version which supports them has been out for some time.
I'll put finding that out on my TODO list.

Also, what I would like to know: Is BIP21 implemented in the current standard Bitcoin client for Windows?

While it might not be worth doing it on the CPU of the phone I would be really curious of benchmarks on a typical Android GPU.
They are powerful for being integrated in a phone, and their power usage is low probably.

Use this:
https://en.bitcoin.it/wiki/Mining_hardware_comparison
and this:
http://www.alloscomp.com/bitcoin/calculator.php

Updated to be more user friendly - Explains how to copy-paste now
Also, I've added an explanation of why it is implemented as manual instead of automatic copy (browser issues).

... and an article on how to get it:
http://leo.bogert.de/2012/02/22/simple-bitcoin-donate-button/

I've been looking for a very simple way to add a "Donate Bitcoin" button to my website.
Found various threads here but no solution.

So I invented my own way and wrote an article about how to get my "Donate Bitcoin"-Javascript button on your website.
Came here to post it in the various threads which asked for such a Button.

Here is the article:
http://leo.bogert.de/2012/02/22/simple-bitcoin-donate-button/

Here is a file uploaded to my webserver to validate my username:
http://www.bogert.de/temp/bitcointalk-whitelist-request.txt