It's worth pointing out too that investing in mining is a losing proposition long term - the bitcoin currency is capped at 21 million units, and once those are all mined, there will be no more mining - the emphasis will then shift to collecting on posted offers to quickly verify transactions, and I'd expect the market for that kind of activity will quickly settle out to a few huge transaction houses with more processing power than you can ever hope to throw at it (essentially, the first bitcoin clearinghouses/brokers for lack of a better term), and who will then collect the lion's share of the fees for verifications.
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-Scott
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