We're doing a game jam here at IGN for Ludum Dare 20, the team is Justin, Colin, Evan and Chris from Interabang, Kent from Ethereal, and me from here. The theme is "It's Dangerous to go Alone! Take This!". We went through a few ideas, right now we've narrowed it down to three:
Nuclear Hand Grenade
Acid Rain Umbrella
We're going to make prototypes for each one in the next few hours and see which one ends up fun. I'll be updating the blog every few hours with our progress.