I started TypeMotion a couple of years ago for that very purpose, but I never promoted it (even to friends / family) because I wanted to wait until 'before NaNo

I started TypeMotion a couple of years ago for that very purpose, but I never promoted it (even to friends / family) because I wanted to wait until 'before NaNoWriMo' to announce it, and completely forgot the next year. Then, I decided to rip the guts out of it because I decided that the pinnacle of what I wanted it to do looked exactly like the comments on 'djangobook.com', where user-contributed edit suggestions sit right in the left margin, represented by little bubbles -- then something else came along and my pet project got discarded. :-\