Posting this here in case people miss the Star Trek thread I originally posted in:
Free books based on the FASA Four Years War (http://jollyrogersproductions.net/?page_id=95). I've started the Romulan War books and they are pretty good so far.
I'm currently up to book 2 of Four Years War, and the series is an excellent read. I'm finding it better than a lot of the official novels.