Check this out:
http://www.americanbanker.com/issues/177_97/bitcoin-banks-fixed-exchange-dwolla-1049461-1.html?zkPrintable=trueIn particular:
...Dwolla prohibits customers from engaging in any business regulated by Financial Crimes Enforcement Network, including money-services businesses. Dwolla also requires its customers to get prior written consent before using it in association with any online credit and virtual currency systems.
That's created something of a headache for Bitcoin middlemen such as BitInstant, which funds the Bitcoin exchanges by providing a float to customers from its own bank accounts, or through providers like Dwolla.
BitInstant has accounts with Bank of America (BAC), Citgroup (NYSE:C), JPMorgan (JPM) and Wells Fargo (WFC). Customers can deposit money, which BitInstant in turn places into the exchanges to buy or sell Bitcoin.
"We've reduced our reliance on Dwolla," says Charlie Shrem, the chief executive of BitInstant, of New York.