Either FBI didn’t want to let the cat out of the bag but there are plenty of currency exchangers which will exchange bitcoin for webmoney and vice versa.http://www.wired.com/threatlevel/2012/05/fbi-fears-bitcoin/ I wonder how long it will be before .gov entities setup their own illicit currency exchangers in order to track transactions. "....In the document, the FBI notes that because Bitcoin combines cryptography and a peer-to-peer architecture to avoid a central authority, contrary to how digital currencies such as eGold andWebMoney operated, law enforcement agencies have more difficulty identifying suspicious users and obtaining transaction records...."