Great chance to meet people, learn technology, and catch up with old friends. If you didn't get to go, you can see all the sessions by going to

http://sessions.visitmix.com

Videos are downloadable. I still have the entire MIX07 conference on my Zune, and will be adding this conference as well. If I recall correctly, it's around 7GB for the whole thing, so there's room on even the smallest Zunes for it.