You will find a list with these programs at:
http://www.casinoaffiliateprogram.com/gamblingbill.html
And it is perfectly legal to promote the casinos of these affiliate programs. In theory there could be some legal programs for the programs themselves, but there certainly won’t be any legal problems for webmastes. It is not your job to exclude US players, it is the job of the casinos.
Thanks James but I was looking at http://www.gambling-law-us.com/Federal-Laws/internet-gambling-ban.htm and found this section that is talking specifically on Affiliates:
“The federal aider and abettor statute, 18 U.S.C. 2, provides:
“(a) Whoever commits an offense against the United States or aids, abets, counsels, commands, induces or procures its commission, is punishable as a principal.
(b) Whoever willfully causes an act to be done which if directly performed by him or another would be an offense against the United States, is punishable as a principal.”
The criminal provision of Section 5366 creates a new “offense against the United States.” All those who aid or abet an online gambling website that is in violation of Section 5363, and thus of Section 5366, are punishable as if they were the online gambling Website. The same goes for those who are employees and officers. In appropriate cases this “punishable as a principal” law may also ensnare directors, major shareholders, advertising media, affiliates and those who are so-called consultants, team members or front men for the online gambling Websites.
According to this affiliates are exposed exactly like the operators.