http://promo.ereader.com/free/
I'm not sure if this just started or if it has been going on since December 1. eReader.com is giving away a different free ebook each day. Today's ebook is
The Magazine of Fantasy & Science Fiction August 2005 which is the latest one in ebook format. Normally these are $3.99. You do have to create an account with them which includes a credit card number. They use that to encode the ebook so you are less likely to share with the world. That is the kind of DRM I like. No activation or rootkit or any other nonsense.
So, go ahead and add a repeating task to your Pocket PC from now until December 31 to check out what they are releasing each day.