I got 0.05 BTC from the Bitcoin Faucet. It looks like there's nothing meaningful I can do with 0.05 BTC, and I'm not certain I'll ever have more, so I'm donating it to SIAI instead of back to the Faucet.
I'm really just posting this so that the 0.05 BTC donation doesn't come off as the signalling equivalent of a 10-cent tip. If I do make more BTC, I'll donate at least some of that as well. (Actually, donating all of it sounds like a good way to avoid annoying tax questions, so I'm considering that.)
Now you can donate to Singularity Institute using Bitcoin.
Currently Bitcoin mining appears to be profitable as only bubble economics can be. Already some Less Wrong users have purchased GPUs and started mining Bitcoin. Please consider sending some Bitcoins to SI at address 1HUrNJfVFwQkbuMXwiPxSQcpyr3ktn1wc9
2014 Edit: Please donate Bitcoin by using the Bitpay link on MIRI's donate page. Thanks!