Does anybody know where you can download historical BTC data? Ideally I'm looking for a CSV file I can import in Excel with Open, High, Low and Close data.

What guarantees are there that the supply of bitcoin will be limited? Couldn't the code easily be changed to allow more than 21 million bitcoins?

Are there any iOS bitcoin clients available or in the works?

What are some practical ways or technical ways that Bitcoin or an alternate cryptocurrency could be better? For example, an encrypted wallet.dat file is already being worked on. If there are good solutions already please point them out
1) are there any Bitcoin client applications for mobile OSs such as iOS, Android, Symbian or RIM?
2) is there a quick way for a brick and mortar stores to quickly accept BTC payments? Say a customer walks in with a Smartphone that has a Bitcoin client or other app that he could use to send or "Bump" BTC to the cashier of the store to pay for something?
3) is there a quicker way to get a confirmed BTC payment (6 confirms usually takes about an hour or so)?

What else would you like to see Bitcoin (or another cryptocurrency) do?

If you place an order through the Mt Gox web site the order has to be for a minimum of 0.1 BTC. Yet when I look at the order book, I see many orders for less than 0.1 BTC. I heard that using the API you can place orders for 0.01 BTC. Can anyone confirm that? Also, is anyone aware of other differences between using the web site and the API?

Mt Gox and most other BTC exchanges have been trading on an agency basis where they match buyers and sellers and receive commission for matching the 2 together. Now I see that "Mt Gox opens 15 new currency markets"
https://mtgox.com/press_release_20110902.html
But instead of having the orders within 1 currency only trade with orders of the same currency, I see they post "Mt.Gox’s custom implementation of a multi-currency platform is unique in that currency markets are not separated from one another, and traders are not limited to their own currency market. Instead traders access the entire market with the trade priority being put on their native currency."
If John wants to buy BTC with USD and Bjorn wants to sell BTC for SEK, the only way these 2 orders can trade with each other is if there is a middleman in between, either Mt Gox or some other market maker. This middle man is the counter party to both John and Bjorn. Does anyone know who is serving as the middle man, Mt Gox or someone else?

Do you prefer to buy on the way up or the way down? I prefer to buy on the way up. Since BTC has been in an intermediate down trend, I haven't been buying. If the trend can stabilize and turn back up, then I'll be a buyer.

I just looked at
http://www.bitcoinwatch.com/
where a graph at the bottom shows the Hashrate Distribution.
DeepBit looks to have about 40%. If they get over 50% does that mean that they compromise the Bitcoin network?

I have the Bitcoin client version 0.3.24 installed on my computer. The only reason I see to have it running is if I am sending or receiving BTC to the wallet on my computer. Correct me if I'm wrong but transaction fees only go to miners. Am I missing something here?

Since Mt Gox commissions went back to 0.65% from 0.30% trading volume has decreased significantly. As of 9:03 EDT on Aug 18th, I show volume of 16,521 and range of 10.679 to 11.04999. If this continues, it looks like a bad business decision. Volume was at least triple before the commission increase. If I were Mt Gox I'd rather earn 0.30% on 3X than 0.65% on X. It also leaves the door open for other exchanges to offer lower commissions, either temporarily or permanently. With lower volume has come lower volatility too. A 37 cent range used to happen in half an hour, now it's the range for half a day.

Como comprar e vender Bitcoins (BTC) usando Reais do Brasil (R$) BRL

Comissão Atual: 5% do valor da transação
Limites atuais para COMPRAR BTC em R$: Mínimo de R$ 300,00, Máximo de R$ 3.000,00
Limites Atuais para VENDER em BTC: Mínimo de 10 BTC, Máximo de 100 BTC
-----------------------------------------------------------
Como comprar BTC usando R$ (passos A a D)
(A) Copie o texto em VERDE, preencha-o e envie para
EuSouBitcoin@gmail.com

Eu quero COMPRAR __________ R$ (Reais do Brasil) de BTC (Bitcoins)
Meu endereço de recebimento dos Bitcoins é
___________________________

(B) Você receberá uma confirmação via email com instruções de como efetuar um depósito no Banco do Brasil.
(C) Efetue o depósito.
(D) Assim que seu depósito for creditado na nossa conta seus BTC serão enviados ao endereço de recebimento e você receberá um email de confirmação.
-----------------------------------------------------------
Como vender BTC usando R$ (passos 1 a 4)
(1) Copie o texto em VERMELHO, preencha-o e envie para
EuSouBitcoin@gmail.com

Eu quero VENDER __________ BTC (Bitcoins) em R$ (Reais do Brasil)
Nome do Banco _____________________
Número da Agência _______________
Número da Conta ____________________
Nome do titular __________________
Número do CPF ____________________

(2) Você receberá uma confirmação com instruções de como enviar seus Bitcoins.
(3) Transfira os BTC para o endereço que você receberá via email.
(4) Assim que recebermos seus BTC, nós os venderemos e enviaremos o equivalente em R$ para a sua conta bancária via DOC e você receberá uma confirmação via email.
-----------------------------------------------------------
Nós operamos com os mercados mais ativos em R$, BTC e U$D para conseguir os melhores preços para você. No momento, permitimos apenas ordens de mercado.
-----------------------------------------------------------
Exemplo de COMPRA de Bitcoins
Eu quero COMPRAR R$ 500,00 de BTC (Bitcoins)
USD/R$ 1,5692
BTC/USD 16,75
500 x 0,95 = R$ 475,00
475 / 1,5692 = USD 302,7020
302,7020 / 16,75 = 18,0718 BTC
Você receberá 18,0718 BTC neste exemplo
-----------------------------------------------------------
Exemplo de VENDA de Bitcoins
Eu quero VENDER 30 BTC (Bitcoins) em R$
USD/R$ 1,5692
BTC/USD 16,65
Tarifa de DOC: R$ 8,00
30 x 0,95 = 28,50 BTC
28,50 x 16,65 = USD 474,5250
474,5250 x 1,5692 = R$ 744,62
744,62 – 8,00 = R$ 736,62
Você receberá R$ 736,62 via DOC neste exemplo
-----------------------------------------------------------

With Mt Gox down, what's the best site to use for BTC reference prices (bid and ask)?

Topic: Since bitcoin is a "virtual commodity", why not create a bitcoin exchange traded fund (ETF)? You could make 1 ETF share represent 1 BTC. If someone could successfully do this it would certainly help with regard to exchanging BTC for fiat currencies. Discuss amongst yourselves.

Has anyone used BitMarket.eu ? What's your experience, please share the good and/or the bad.

Has anybody used ExchangeBitcoins.com ? Please share your experience, the good and the bad? I'm looking for good alternatives to Mt Gox.

What are some good alternative exchanges to Mt Gox?

Like many people, I'm trying to figure out how Bitcoin will playout. Will it be successful or not? First I think Bitcoin is NOT a digital currency. It's more of a digital asset or digital commodity. Calling it a digital currency immediately conjures up thoughts of counterfeiting and crackdowns by governments. Which brings me to my main question. What would happen if possession of bitcoins or bitcoin software is outlawed?

For the possession of bitcoins question, it is could be hard for a government to find a file on a computer hard drive, pen drive or on a cloud somewhere. But regarding bitcoin software, wouldn't it be relatively easy to find those computers that are running bitcoin software? I'm not an IT person but couldn't the govt track down the IP address, identify the user and then stop the software? Also, if bitcoin were outlawed, only outlaws would use bitcoin which would diminish its desirability to law-abiding citizens.