I trade at Bitfloor.com and I like it. They *had* free, anonymous cash deposits working for a while, which was completely awesome, but then somethign happened and they're trying hard (so they still say) to get cash deposits back online, but for people with ING accounts, you can still fund your account for free that way.
Anyways, I wrote this web based trade facilitator that connects to their trading API:
http://BTC4me.comIt will give you a good look at what their market looks like.
SM
http://SpottedMarley.comhttp://BTC4me.com