http://thelede.blogs.nytimes.com/2010/12/04/paypal-suspends-wikileaks-account/
Paypal has suspended Wikileaks from its service
Interesting tactic, but I think it is ultimately doomed to fail. People willing to pay for wikileaks will probably be willing to use other payment services, and there is certainly nothing stopping Asange et al from designing their own service to recieve funds.
Obviously that opens them up to "money-type" legislation that might be launched against them, but considering there are no clear laws that Wikileaks is breaking, they could hardly be investigated for "funding crime" or "living off the avails".
Most importantly, attacking wikileaks' net infrastructure in terms of access to funding, amazon, twitter, etc, doesn't stop them from recieving leaks, or giving them to the news agencies that make them available to the public. If this is pressure from the American government (which I suspect it is [re: they are probably saying "we will charge you with whatever we eventually charge wikileaks with]), it seems the most they can do are harrassment or delaying tactics.