Go to the eReader.com website. They have a reader which is pretty good. It is not in the Market yet, but it's not hard to download. Also, take a look Aldiko (both the regular and Pro versions). This is probably the best one out there right now. I have a lot of books in that format and they read very well. I have a Sony reader, so this is not my preferred method of reading, but if I am stuck somewhere for a few minutes, its nice to be able to whip the Droid out and get through some pages.