Mobipocket was built on top of Rick Bram's DOC format, I seem to remember. Adding some HTML-style formatting and a bit of image support, but it could still show DOCs, and several other Palm readers could, too.
I didn't read a lot on the Palm - it was more of an emergency backup, like my phone currently is - but I did read a bit of public domain, one or two books from Baen's free library, and what I guess must have been some pirate books, although I wasn't really aware of that at the time.
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