Olympus Pen E-P1 vs. E-P2?

I am buying a new digital camera sometime this month and I have fallen in love with the Olympus Pen series. I can't decide though which one to get. The E-P1 is cheaper than the E-P2 but does not have as many features. My question is which one is better. The E-P2 only costs an extra 100 where I have seen it so I don't mind paying it but is there really much of a difference between the two?