Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Mine hasnt pushed it in the last 2 days or so.... its not the first time though, it's happened to me before. A reboot usually fixes it, I've just been too lazy to reboot it since yesterday
 
I have a 3G and I've had this problem ever since I updated to iOS 4.0. I haven't gotten around to updating to 4.01 to see if it fixes the problem.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.