The Motorola Droid (I'm a long-time Verizon Wireless customer). I found an Android book reader, Word Player (
http://www.word-player.com/) that seems to have some form of highlighting of text - not quite annotations, but at least this helps me find areas of books I need to improve.
Unless the local shop runs out, I should have my Droid this Friday, so I can play with it this weekend.
Cheers, Carl.