We got some good dev work done at the symposium, not just in the dev meetings but throughout the week in conversations and dabblings.
One of the big developments was the official announcement that MIT Press will be publishing a SuperCollider book. It's a great recognition of where SuperCollider has got to, and of course I'm really looking forward to writing my chapter...!
We also agreed to tighten things up a bit and have formal "point releases" (3.1, 3.2, etc), which will help people understand compatibility issues more clearly, etc. It also means the book can be targeted to a particular release, again giving more clarity.
Lots of other non-headline things have been agreed/fixed/developed. SC 3.1 is gonna be wicked.