Here are my thoughts, whatever they are worth:
1. I learned that it is really smart to drag out your outlining over a month, thinking about it from a new angle each time. It really got my creative juices flowing. I might do some version of this every time I map out a new novel. (Which I hope will be often)

2. It was really hard to do this in June. I thought November was a crazy month for Nanowrimo, and June is no less so, especially for moms who suddenly find themselves trying to map out a book and take care of kids during summer vacation. Maybe it's the craziness of it that makes it work--you have to be super committed. If not, then picking a month closer to Nanowrimo might be a good plan.

3. I posted some of my work in the NSG thread (until it got too cumbersome--which was shortly before I dropped out, hence...) and it is important to have the accountability of knowing a group is expecting you to post something. It made me do a better job than I might have otherwise. On the other hand, I was glad I was the only one doing it because I really needed to take breaks on those days when we were supposed to be critiquing everyone elses posts.