I dropped mine the other day from about 2-3 feet to a carpeted floor. I wasn't concerned until I picked it up and the video was jumping all over the place. So, I immediately turned it off and then back on. When it came up with a rock-steady Nokia logo and the intro video I was relieved, but then, when the desktop came up, it was jumping all over again.

So, I turned it off and pulled the battery. I restarted it and it behaved exactly the same - rock solid on the intro video but scrambled on the desktop. I was rather upset, but I slid the screen lock in place and left it alone for about 15 minutes. When I looked at it again, everything was back to normal. No problems since then.