Hello
I bought my n900 12 days ago, but now on my browser i can't use my mouse it mean when i move my finger from the left side of screen nothing happen!
also when i move from the right side of the screen nothing happen! (it must show my browser history!! )
can you help me?!?!

I had a similar problem - I had better luck using the stylus than my finger - you also have to sweep it really fast... have a read of this thread which should help you in the way it helped me (I can make it work first time every time now):

http://talk.maemo.org/showthread.php?t=46378

Its hard to find the correct zone, but when you do you'l easily be able to get it! scroll from 1 cm off the bottom left of the screen, start from off the screen too, i find it helps!

Edit: Read the other thread about swiping and someone suggested recalibrating the screen. Maybe that was my problem before my re-flash. I don't know.[/Edit]

I can't help you, but I'll say this, if it would make you feel any better: I used to have the same problem.

That was before I re-flashed everything for other reasons, though, and now mine works just fine.

Do you get random reboots?

I used to have random reboots before, even after they fixed (almost all of) them. Probably to do with my wireless router, that I've since replaced. I just figured not getting the mouse had to do with some file being corrupted while suddenly rebooting and didn't pay it any more attention, since I was going to re-flash anyway.

About the swiping: It shouldn't be too long, I think. Quick and short, but I'm sure you've tried all kinds of ways.