Here is Microsoft's Reader Site, they offer FREE Full Featured Ebooks. They did this to promote and get people to use Microsoft Reader. Anyways, you need to have Microsoft Reader 2.2 (See Aximsite's Download Page and then Dell Patches to find the download or find it on the Microsoft Website) and you need to have Reader Activated (It shows you how on a link). And you're off!
http://www.microsoft.com/reader/default.asp