BusinessWeek has a nice Review of the T-Mobile MDA. While according to the review it's not quite as good as the vaunted Blackberry or Treo, the reviewer liked it well enough. The MDA is a very cool looking device with the slide out keyboard that looks to be much larger than the keyboard on a Treo. Too bad in my area T-Mobile's coverage is not good or I would be looking for one for myself. The MDA is a quad band phone and also sports EDGE and Wi-Fi connectivity.