I just bought an iMac 24" wich will serve as a TV/mediacenter. I added the wireless keyboard, but not a wireless mouse. I don't want to use a mouse while sitting/lying in my couch, thus I am thinking about buying a wireless trackball. I am a bit concerned though about the size of it. Does anyway have experience with using a wireless trackball while lying back in his couch watching a movie, or chatting? I have the wired mighty mouse for doing serious work. A wireless touchpad would also do I think, but I haven't seen any of those on the apple store or amazon. Feel free to share you thoughts.