Paypal's Gambling Policy -
http://www.paypal.com/cgi-bin/webscr...mp;ed=gambling
In part:
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You may not use PayPal to send or receive payments for any form of gambling activities, including but not limited to payment for wagers, gambling debts or gambling winnings, whether conducted online, in person or through any other means of communication. Gambling includes placing, accepting, recording, or registering bets, or otherwise carrying on a game of chance for money, property, or other thing of value. This prohibition includes all gambling operations, even if and where such activities do not constitute unlawful conduct.
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It seems fairly comprehensive.