I stumbled across a posting somewhere which mentioned that three of the 2007 Hugo Nominated novels were completely available online. I knew about Blindsight, but I didn’t know what the other two were. After some searching and hunting I found the other two: Rainbow's End and Eifelheim. I'm not terribly excited about Eifelheim, but Rainbow's End was the eventual Hugo winner, so I think that'll be one of the next novels I read and I'll chip away at the text of it.
The only disappointment here is that Eifelheim is available only as a PDF. I hate reading from a PDF file!
Not available for free: His Majesty's Dragon and Glasshouse. Probably because they don't need to be.