I missed the show last night but these popped up pretty quickly.
I haven't watched the Wii vidoes yet (they weren't up last night when I was looking at these) but the 360 starts about 1/3 of the way through Times Square and plays up to the end of the final Stay Puft fight (though they don't finish it for you) and then they explore the firehouse a little.
1Up Gamenight Live Stream (360) Part 1 (HQ)
1Up Gamenight Live Stream (360) Part 2 (HQ)
1Up Gamenight Live Stream (360) Part 3 (HQ)
1Up Gamenight Live Stream (Wii) Part 1 (HQ)
1Up Gamenight Live Stream (Wii) Part 2 (HQ)
1Up Gamenight Gameplay (Stream Test) (HQ)