I found this online today.
http://www.post-gazette.com/pg/06162/697357-84.stm
Interesting quote:
Despite its illegality, an estimated 4 million to 7 million Americans are Internet gamblers, with poker driving the latest surge. The state of Washington made wagers over the Internet a felony starting June 7, but officials there have indicated they will not be enforcing the law aggressively.