I'm in love... with my iPhone 4!

My birthday was on Monday and my amazing hubby got me the best gift... a new iPhone 4!  I didn't ask for one and I didn't even think my contract was up but I was excited he got it for me.  I loved my iPhone 3G but the 4 is awesome!  It seems to run a little faster and there are some interesting updates that have been made.  It has the ability to Skype but I haven't tried that or the Face Time.  The camera on the 4 is a lot better then the old one.  Here's a pic I took on the 4 vs the 3.

Does anyone have a 4 and have any tips or good apps they can suggest?

iPhone 3G

iPhone 4