A quick fyi: Mark Glaser at PBS's MediaShift has just published a handy guide to e-books. It covers the history of e-books, the competing e-book readers, the pros and cons of working with e-books, what Google and Apple are now doing in this space, and more. Good stuff.
Separately, I also wanted to flag a collection that features e-texts of 100 major literary classics. You'll find it over at universitiesandcolleges.org.