Here's a link to a chart of some of the different readers with pictures. One of the big items to consider is what formats it supports, what DRM format it supports, and what publishers/sources are partnered with that hardware. I went with the Bookeen Cybook because the publisher (Baen) of a lot of the authors I read uses the MobiPocket format. They've also got a lot of their older books available free. Every so often, they've added a CD full of books, pictures, etc. to the first printing of an author's latest hardback book.