So, I went through the sig-wall and recorded all of the sigs as of right now (probably won't be many more).
We got ONE HUNDRED AND SIXTY-SEVEN signatures. (Some were illegible or single characters, so we have about 150 actual legible signatures.) A few repeated themselves a few times. (Navineous, Toudou, Super.) Repeats weren't counted or listed.
RealG has already told you the competition results, and I might put those into the OP some time tomorrow. You can also expect to see some links to the level files tomorrow as well.
As for my feedback on the whole event: I look forward to perhaps organizing this again next year, since that part was really fun (although a bit exhausting... I went for about 35 hours without sleep getting everything together before taking a nice long nap before the actual competitions started), but we'll definitely need someone else to actually deal with the event, conducting the competitions and all that. I just couldn't handle all the people who failed to read the brightly colored instructions and who apparently had absolutely zero common sense.
Hey, everyone. I managed to finish getting all my own screenshots posted on a page of my website. If anyone would like to see them, go to my site and then navigate to the page titled, "MineCon 2010." There you'll see a brief summary of the games, followed by 23 screenshot pictures covering the 30th, 31st, and 1st, including RealG's epic 16-player spleef match in that miniscule arena and plenty of pictures of the races. Not many from the Build Compo, though. The victors of the events are also listed there (and it is noted that Grief-a-Thon was cancelled).