If you have a Palm or Handspring, I recommend
Mobipocket. They sell online books but they also have a some free books. I believe that in addition to reader software for Palms and other handhelds, they have it for PC's.
Best of all, they have publishing software that lets you take text files and turn them into e-books. This means that you can take Project Gutenburg .txt files and turn them into e-books for handhelds. Last I checked, the publishing software was free for personal use.
Mobipocket has a large collection of Sherlock Holmes, Wizard of Oz, Tarzan, and Carter of Mars. They used to be free but I just checked and they appear to be charging now.
The publishing software is pretty easy to use, until you decide to use the feature to create chapters.
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Barack Hussein Obama