
Munseys.com is a great source for quick and easy reading, especially if you're not up to tackling a Tolstoy novel at Gutenberg.com.
Munseys has over 20,000 dime store paperbacks and pulp fiction ebooks for free covering every genre imaginable. Many of the books are from lesser known or even forgotten authors who never cracked the big time, but I found Philip K. Dick, Kurt Vonnegut and Jack London within a minute or two.
On my PSP, I adjust the display settings to 'just fit" and download the html version of the books. You won't get full screen display because of the frames, but you can navigate well enough to read.
A great source of free ebooks.