Smashwords has created a special section for NaNoWriMo books. The idea is to allow people to share their progress and people can keep downloading the book as you update it. I think it might be cool for people to see a rough draft as it develops.
Now, there's also the risk that people might look at it and judge your work in comparison to completed projects. But I really don't think that many random people who don't know what NaNo is are going to stumble upon the book. So I've decided to share my NaNo work so people can read the whole thing as it's created. I expect to have a completed novel with light editing by the end of the month.
So if you want to see what I have so far, you can find it at Smashwords:
A Daughter's Revenge: A Necessary Evil Tale