VirWox has only SLL/BTC and the fees are pretty high.
NMC is traded at www.vircurex.com and www.BTC-E.com

other european exchanges i have been successfully using are

www.bitcoin.de
and
www.bitcoin-24.com

then there's www.mtgox.com but they require ID confirmation if you move "fiat currency" which was putting me off for now