I recently read this ebook, Agent to Stars, and loved it! It's an awesome book that's well written and free! It manages to combine some great sci-fi with some really well written humor. I downloaded this book from manybooks.net and then saw it for sale at Barnes & Noble for $13...not sure why they're selling it when it can be downloaded for free...
here's the link to the book:
http://manybooks.net/titles/scalzijo...the_stars.html