Names for each grade of the iPad: Light iPad, Medium iPad, and MaxiPad and if they ever allow tethering.... well, you can guess if I'll ever get any Apple gadgets.
I think tablet PCs are better than any of the other options. Reason? It's a full blown computer plus an e-reader. I've got a Fujitsu Stylistic that I use to browse the web, email, play games, watch movies, and read e-books. If I get tired of using the onscreen keyboard, I can always plug in a keyboard and mouse and prop it up against a book or something. And I can plug in an external dvd player, too.
Of course, I don't get the 1 week battery life that a kindle or sony ereader gets, but I think 4-5 hours is pretty good for the small battery.....