There's a brilliant software called SallingClicker that I used when I had Nokia/SonyEricsson phones. Unfortunately BlackBerry isn't a supported phone. Kind of weird considering there are hundreds of phones supported.
Found one page with instructions on how to install it on a BlackBerry and it installs fine but the keymapping is a little bit of, at least on my 9700. Controlling PowerPoint presentations works but the keymapping messes things up a bit. Here's that page.
Last edited by Slovnitjki; 05-04-10 at 01:01 PM.
Reason: Forgot the second link.