I did NaNo in ’09 and ’10. I started to do Camp NaNo, but I couldn’t get going on it. Now I’m in the beginning stages of a WIP. I don’t know if I’ll do it this year or not.
I think it’s a great motivation boost though and I don’t regret doing it at all. The first year I did it, I wrote a historical romance and reached 50k, but never finished the book. Last year I wrote the second book in the series I’m working on, but I’m not very happy with the plot. It’s going to require a lot of TLC.