I'm involved in a couple of sites that are definitely book related. One of them, Booktastic.org has a library of free ebooks (with links to such as Gutenberg.org and Manybooks.net) and the other discusses specific types of books (and other media) in The Venus Café.
I have found Calibre but it doesn't really do what I want -- convert from "normal" PC text/document formats as well as ebook formats to other ebook formats. Calibre doesn't handle azw format.
Has anybody found any free software that might help me?