Don't know about the quality or anything, but hey they're free.
Check it out here http://www.tor.com/Default.aspx
I'd like to add in a plug for Baen Books (a Tor sub-house I think, but don't hold me to that). Its a SciFi house that does some pretty good light fiction. Their free library is great. They really seem care about the work, the writers and the readers.
www.baen.com
-Ed