I didn't go, but I would love to try to do that next year.
If I go, more than anything, I want to learn. Socialization is important, but the sessions would be of much more interest to me if they helped me add value to my blog. I'd like to know how the probloggers got started, how they monetized their blogs (in case I ever want to do that in the future). I'd like to learn about blog design. Sessions about writing good content would be helpful as would building readership. I would like to see platform-specific sessions as well as going from a platform to a self-hosting blog, step-by-step. I'd like to learn more about stat counters and stat trackers as well as how to optimize my blog using stumbleupon, twitter, etc. I'm sure all that was available, and much more, and I'm sure there are articles on the Internet, but hearing it directly from the source would be more effective for me.