Welcome to MR, scotmad.
You can explore using
Calibre to manage your library of DRM free books and Kovid, the creator, frequents the forums here. MR even has a dedicated
Calibre forum.
The MR Library has free ebooks that have been beautifully formatted by some very dedicated MR members. I think your bebook uses
ePub format format.
feedbooks.com and
manybooks.net are a couple of free ebook sites along with
Project Gutenberg.
And for free and for purchase ebooks check out
smashwords.com and
baen.com Plus Baen has a
free library
Have fun in the forums and ask if you have any questions.
Check out my signature and click on the links to find more information about MR authors.