I'm personally a big fan of roulette and slots and I look for casinos that allow me to use relatively small bet sizes (around 0.001 BTC).
If there's a progressive jackpot, that's also a big plus for me, especially if they don't require huge bets to be able to win it.
So let me hear what you are looking for in online Bitcoin casino's...
I prefer Dice Gambling sites. What I'm looking for are those things:
1. Low, 1% or less, house edge;
2. Fast (2-3 bets per second) betting;
3. Nice ppl to talk to in chat;
4. And also a big (500-1000 sats) faucet doesn't hurt. )