I hope that I am not the only one who has had the misfortune of having their trackball get stuck and not move in one direction... But I couldn't find any posts on it so here is a link that I found helpful in getting mine back to going.

BlackBerryInsight » How to clean your BlackBerry’s Trackball

I'm not so sure that the trackball is going to last out my contract on the phone, it just doesn't seem like it's sturdy enough to make it.