I use bitbet.us
Are they any good?
BitBet.us is very reliable.Their operators have much more to loose on other ventures than the reputation hit they could take on scamming with this site. It is a parimutuel site, so things are a quite a bit different from traditional sportsbooks. They tend to have a wide variety of bets, and making new bets on there outside of sports is dead simple. Parimutuel betting creates interesting market making opportunities if you have the capital to put into a bet you care about. On bets I've cared to correct the odds for I have put more into single bets on this site than I have placed onto multiple concurrent bets for the traditional BTC sports books combined.
For a more traditional sportsbook I like BitcoinSports.eu as it uses and accountless model. You can also build some monster parlays there if that's you thing. Their maximum bet is a bit lower than some other books, but I prefer that to a cowboy operation writing checks their body can't cash. Until recently there was a site called BlockBet that followed a similar model with higher max bets that never innovated and then just ended up broke. I use Bitcoinsports.eu nearly daily, and the fear that I might break the book lingers at the back of my mind when I decide how many bets to have outstanding with them at once.
I still play a bit with bitbook.biz, but part of bitcoin's appeal for me was not keeping a standing balance in other people's accounts. Their odds are nice, but I just do small money there. Other people might be able to give them better rep.
