The Palm devices were great, I had one of the originals, then Samsung had a flip-phone version, and Treos followed after. I used the heck out of all of them, and even wrote some code for the platform. It was really sad that they lost their way.

"Form factor" can be a slippery notion. The genius of the iPad design, I think, is that it _couldn't_ be mistaken for an educational device. It actually looked like it belonged in a leather folio next to some important papers, not in your kids' school bag.