http://online.wsj.com/news/articles/SB10001424052702303563304579447020246651110
Goodbye, Bitstamp and BTC-E.Quote
The Treasury Department will come after the many digital currency exchanges and administrators that haven't registered with the Financial Crimes Enforcement Network, the Department's top official for terrorism and financial intelligence said Tuesday.
since they are not us-based, does it matter? it's more like a "goodbye, US, until you get your own exchange"