Many times asked question and many times same answer from, in my opinion betcoin.ag and fortunejack are best places for playing poker with bitcoins. I played on nitrogen for some time, but I didn`t like design, for my taste betcoin.ag is the best about this things.
I like this two places cause there you can always find some good tournament, or active players on cash games. That is a good thing that in every part of the day you can find some micro buy in tournament, and have fun while you play poker. Its not always about risking big amounts.
ARe there lot of sites where you can poker with bitcoins i dont think there are allot of sites where you can do that i think more just for dollars like pokerstars one of the most used,.