I've e-mailed various on-line sportsbooks and poker rooms saying I'm a US citizen and will play with you if you accept bitcoins.

I'm hoping that a major sportsbook would figure there isn't much risk or work involved. Doesn't seem like much for a sportsbook to spend $10,000 on bitcoins (take the market to 50c bid on exchanges) and start accepting bets in bitcoins.

I would think taking the banks out of sportsbooks would be huge for their profitability.