The legal problems with online poker in the US involve the money -- specifically the transfer of it to/from the players.
Bitcoin based sites do not have this problem, so US based players can play there.
However there are several things that would discourage me:

There is total anonymity -- collusion becomes virtually impossible to detect, since you never know who is at your table.

Stakes are (usually) in the order of 1/1000 bitcoin -- so roughly NL 100

Bitcoin itself is dangerous. Some bitcoin exchanges have recently been "robbed"

Lack of regulation -- all other sites that I know of post somewhere who licenses them. If such things exist, they were not visible on any bitcoin based site I checked.
So for me, I'm staying away for the time being.
I was considering investigating and experimenting with bitcoin, but hadn't got around to it yet.
The the most recent fiasco at MtGox and I'm even more eager to "keep it real"
Cheers,
--VS