I'm using the
Archos 5 Android. The thing is fantastic! It's a 4.8" (800x480) device loaded with android so you can put lots of apps in there. I use Aldiko (epub reader) and Thinkfree (pdf reader). Aldiko has a built in e-book repository with hundreds or maybe thousands free e-books to download. The archos does not have e-ink but reading experience has been comfortable for me and it's full color. Also importantly, the device is only 43,2x78,8x10,4 mm - 182g (flash version) so I can pocket it.
Another plus points for me is that it plays most video formats for my animation study!

• MPEG-4 HD (up to 720p)
• MPEG-48 (ASP@L5 AVI, up to DVD resolution)
• H.264 HD (up to 720p)
• WMV (MP@ML, up to DVD resolution) including WMV protected files
• MKV (up to 720p, 2500kbs, 23fps
• M-JPEG (Motion JPEG Video) in QVGA resolution
• FLV, MOV (I haven't tried AVI yet)
With optional plug-in (downloadable from your tablet or on www.archos.com):
• Cinema: MPEG-2, WMV HD (720p), VOB
It has gps, fm transmitter, microphone, accelerometer, fast web-browsing, web tv/radio, tv out (with dock), micro sd slot (flash model), and more (just check out the site). I got mine from Best Buy. They should have a demo unit on display.