Part of the NaNo experience for me includes editing someone else's novel. I didn't do it my first year, but I also didn't win that year, so I don't think I understood. But since NaNo '09, I've edited at least one other person's novel. This year, I did three, and it's been awesome.
I just finished the third one a day ago. It was good. Really good. Like, if I pulled it off the shelves and bought it, I would be happy with it good. The author, a girl the same age as myself, asked me to return it to her within two weeks (it was pretty short.) The only reason I didn't have it back to her after two days was because I thought she would think I was a freak for reading it that quickly and/or suspect a shoddy editing job.
But no (or, well, I hope not.) I sped through that story because I couldn't not. It was awesome. So awesome, in fact, that I considered e-mailing her and asking her for mine back because hers made it look amateurish.
It wasn't perfect. I definitely made some suggestions about it. But still, wow. When she e-mailed me back, she told me that I was the first person to read it. I felt honored.
Yes, I've read some crappy stuff that resulted from NaNo (and I am by no means excluding my own work from that statement.) But stuff like this makes it worth it.
Plus, editing is the best procrastination tool I have :)