http://etext.lib.virginia.edu/ebooks/ e-books You can buy e-books from Barnes and Noble (www.bn.com) or download 1,200 free classics from the University of Virginia Library (etext.virginia.edu/ebooks).
Better still, download the free Word 2000 add-in and create your own e-book from any document (www.microsoft.com/reader/info/selfpublish.htm).
You can then set about converting the 10,000 free titles of Project Gutenburg (www.promo.net). You don't need a Pocket PC to read e-books, either.
A free version of Microsoft Reader that runs on any Windows PC or notebook can be downloaded from www.microsoft.com/reader