I've done some betting on football matches for the champion league (or soccer if you are American) on bwin.com, no BTC there but anyway, its easy to exchange for fiats. I never had a problem with it.
Oh, I knew about bwin.com for a long time but I am not US so I have never played at there although I'd love to try it
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
Thank for your recommendation !