It’s not quite a laptop, and too big to be a PDA, but ZDNet asks, “Should you buy a tweener?” Overlooking the fact that the term “tweener” is stupid and shouldn’t be used, it’s a good question. Their appeal is seductive, since getting significant amounts of real work done on a PDA can be next to impossible, but ultraportables like the new MobilePro 900 from NEC or Vulcan’s Mini-PC can cost almost as much as a full-fledged laptop (or more) and often aren’t all that better for productivity due to their miniscule keyboards and half-sized screens.