From time to time a snapshot of online gambling site rankings is taken which the respected Internet traffic measurement site Hitwise publishes.
Although these are dynamic statistics which change over short periods of time with the ebb and flow of visitors to the various sites it nevertheless makes an interesting short term view possible.
Here are the sportsbook and poker site numbers taken around mid-January:
Top 10 Poker Sites
1) Party Poker
2) Poker Stars
3) Poker Room
4) Pacific Poker
5) Paradise Poker
6) Ultimate Bet
7) Empire Poker
8) Full Tilt poker
9) Absolute Poker
10) HoldemPoker.com
Top 10 North American focused SportsBooks
1) Bodog Sportsbook
2) Sportsbook.com
3) Sports Interaction
4) Pinnacle Sports
5) BetOnSports.com
6) BetUS.com
7) SportsBetting.com
8) Olympic Sports
9) World Sports Exchange
10) SportingbetUSA.com