Time flies! Seems like last LD was 1 month ago… But as the last time, I’m in!
My choice of platform and coding will depends on the theme, but I think it will be:

Code: ActionScript 3
Library: Flixel
IDE: Flash Develop
GFX: Photoshop CS5

or

Code: Javascript
Library + IDE: Unity3D
GFX: Blender (I suck at modeling)

for either options:
Music: FL Studio (saving me from low overall ratings because of poor gfx since LD23 haha)
SFX: sfxr

You can play my last 2 LD entrees
LD23: http://www.ludumdare.com/compo/ludum-dare-23/?action=preview&uid=11711 (Fun 36 and Audio 42!)
LD24: http://www.ludumdare.com/compo/ludum-dare-24/?action=preview&uid=11711 (better than the first IMO, but the max score was Humor 99 :P)

About the theme… I wish Parallel Worlds win. I’ve been upvoting it since LD23 and I think the competition would develop great games. Props for Round 3 Batman subliminar messages.

I hope you will have a great time, because I’ll have for sure!