[sadfsa]

It's already widespread enough to use for some forms of money laundering. If you want to secretly move money from the US to Europe, just buy BTC in the US, deposit them on Mt. Gox (whose domain is registered in Japan, so I assume the servers are also in Japan), and from there sell the BTC and deposit the resulting money in your Swiss bank account.

It's also widespread enough to use instead of a Swiss bank account to hide money. Just move the money into a Bitcoin wallet, encrypt the wallet, and store copies of it on as many computers, in as many countries as possible.