Wow. That new swipe down from the top notification bar/window is absolutely revolutionary. I know iOS 5 isn't out yet, but let me show you what it looks like from a picture I took of my Android last year:
The new Twitter feature and integrated contacts are also just like Android's "Share" and integrated contacts feature.
Reading List = Read It Later.
Tabbed browsing has been on Android since 2.0.
Camera button on the lockscreen and volume up to take picture to make up for the lack of dedicated camera button.
Over the air updates for your apps and OS. What a concept....
iMessage = Google Voice (although it does add MMS support which is sorely lacking from GV)
I'm really feeling the balance tipping a bit here.
I do like RTF support in the mail app and photo editing built in (though there are apps for the latter).