What I wrote originally was that EFF's lawyers must have decided that Bitcoin is not clearly illegal. You seem to have interpreted me as saying that they decided that it is clearly legal.
I'm saying that there's a lot less significance to EFF deeming something "not clearly illegal" than you were implying.
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!