You can buy an OEM replacement blackberry optical sensor [1] for around $5 here: http://www.blackberrypartscenter.com/Blackberry-Trackpad_c_38.html Basically it's an optical mouse. Are you thinking what I'm thinking? [1] http://gigaom.com/2009/12/18/so-how-does-that-optical-mouse-on-a-blackberry-work-anyway/ Cheers, D.