The Nokia Internet Tablet N800 is like a mini-laptop running Linux. I can't possibly cover\capture all it's coolness.
I have watched full length movies on it, played MP3s (via iPhone-type software interfaces with kinetic scrolling), read eBooks (PDF, CHM, DJVU, etc.), surfed the Internet, made phone calls via Skype, taken pictures, captured video, made video chats, Listened to Internet radio AND the built-in radio, played games, ran Abiword, Gnumeric, SciTE, etc. ran Basilisk II\DOSBox\MAME\FCE, etc.
It can connect via Wi-Fi b/g and Bluetooth, use GPS (via other paired devices) and run map programs. It has 2 (!) SD card slots. It has a super-crisp 800x480 screen with twice the dpi that a iTouch has. I bought it because the price recently dropped to ~$200-$230 after the release of the N810 (which has integrated GPS and a slide keyboard).
(Amazon.com has a good price) http://computers.pricegrabber.com/pdas/ ... ce/st=sort
An update called Maemo Linux OS 2008 came out 2 months ago that greatly improves and enhances the speed and functionality, though it can run other Linux operating systems and desktop environments.
Plenty of videos on YouTube about it: http://www.youtube.com/results?search_q ... arch_type=