The forex-broker plus500 has now opened for bitcoin trading. 4:1 leverage, someone is going to get very rich or poor...
Even though they also allow shorting, I think this is great for the price, as they accept credit card deposits and is a very easy way for a lot of people to get into bitcoins.
Its got UK offices/oversight, but from what i can make out, it doesn't allow deposit or withdrawal of BTC, just fiat.