There appears to be a serious problem with the BlackBerry trackball. Check out this video from TheStreet.com. They are having problems with multiple BlackBerrys on an almost weekly basis. That doesn't sound good.
Gary Krakow, Senior Technology Correspondent for TheStreet.com takes you through the problems he's experiencing with his BlackBerry. The trackball gets to where you can't scroll up and down. He swears they have the problem across multiple devices and that other people are reporting the same problem.