Here's one I didn't see on your list.
Name: Sci Fi - Arizona
Site:
http://www.scifi-az.com
Price: $7 - $10
Genre: Sci-Fi
Number: A Dozen or so
Support: Sony Formated PDF's
Format: .PDF
Notes: Michael McCollum authored books. Store run by the Author himself. Also seems to be adding books by other authors also. Author really seems to "get" eBooks.
BOb