The Global Game Jam 2012 was a great experience, I would advice everyone to participate in such an event!
I had a great team of 3 people - one for graphics and code, one for music/sound and code, and me also as programmer - so we produced a mostly finished game in only 2 days.
"I hate myself"
We used löve2D (with HardonCollider, hump and AnAL).
Screenshots:
Progress video:
