For me, the highlight of MWA was insinuating myself into the Arcs of Fire project. I'm not 100% sure that I can start talking about what I'll be doing, but I expect to get some clarification on that soon.
In insanely great coolness, the Arcs of Fire Website contains ink-based discussion forums, apparently powered by Community Server. In my opinion, this is a huge step forward in the ink-on-the-Web experience (sorry if I've missed other ink-based forums...).
Oh, and the Tablet PC party at Varnish was excellent. I've been to way too many conventions to get excited about finger-food and an open bar, but the party was filled with really interesting, really positive people. And sake cosmopolitans? Them's tasty!