I've been reading ebooks on a Palm Pilot for several years and now also on my Blackberry. They don't have the best reading interfaces but they work fine and they are much more portable than larger ebook readers. I've read "War and Peace" on a Palm Pilot and "Notre-Dame de Paris" on my Blackberry so it is possible to read large and challenging books on these devices. You can find free ebooks for Palm Pilot (and several other formats) at http://memoware.com/ and for both platforms at http://gutenberg.net/ .