USD's are bitcoined on bitcoinica at the moment :-)
Bitcoin
1. n, proper. An example of a non-inflationary distributed decentralized unregulated and unregulatable online currency with a peer-to-peer structure founded by Satoshi Nakamoto in 2009. An instance of cryptocurrency. e.g. "Bitcoin has attracted investors from Argentina to Zimbabwae."
2. adj, proper. Of or pertaining to Bitcoin. e.g. "The Bitcoin network has survived another attack."
bitcoin
1. n, countable. A cryptocurrency with little deviation from Bitcoin. e.g. "IxCoin is just a bitcoin with higher inflation." pl. bitcoins
2. n, countable. A unit comprising 100 000 000 of the individual units of currency used in Bitcoin. e.g. "That will be 50 bitcoins." pl. bitcoins, bitcoin (rare, semi-informal)
3. v.t. (informal) To screw or make something look bad via usage of bitcoins. Coinage. e.g. "The USD is being bitcoined again." 3rd sin. i. bitcoins s.p./past.p. bitcoined p.p bitcoining