I'm curious, what are the economics on making bitcoins? How much did it cost to build your rigs and how much do you (expect) to make?
Pre-liquid cooling, This rig was $1800 (though it could only use 2 of the GPUs so if I had only bought 2 it would be $1300). With the liquid cooling, it comes to about $2600. Right now (given current exchange rate and difficulty) it will generate about $40/day, and I've already generated $650 worth of BTC as valued at the current exchangge rate (which pays for more than two of the cards after deducting for electricity).
The difficutly will increase, but the exchange rate tends to go up with it, canceling this effect. After about 50 more days I'll be prof...
There seems to be quite a bit of a Bitcoin interest around here, with several articles about it already: [1 2 3 4 5 6 7]
I propose that links and generic Bitcoin comments should be posted here, instead of making a new discussion thread for each interesting article about the subject.