I just wish someone (i.e. Apple) would come up with a Bluetooth Trackball. As far as I know, there is only *one* obscure model available (http://www.chwangyi.com/the_ball.html) which has gotten only middling reviews. Can't believe Logitech or Kensington hasn't tackled a BT Trackball...
Logitech Marble Mouse
A Look Back at Mighty Mouse