As a lof of people here, this will also be my first Jam.
I will use:
- Objective-C (what means that the game will be for Mac OS X or iOS. Is there any restriction of platform?)
- Cocos2D game engine
- cfxr (for sound effects)
- Grafx2, Pixelmator and Pixen (for graphics)
- Audacity (for music)
- GitHUB (to share the code)
BTW, I am a Brazilian that live in Hsinchu, Taiwan. I was following the list and didn’t find nobody from Taiwan. If you are from ROC and wanna gather, please leave a comment. 
Tags: audacity, cfxr, cocos2D, github, Grafx2, iOS, macosx, Objective-C, Pixelmator, Pixen
I am not sure, but i guess you can compile it for linux/win32 with gobjc
Thank you. I will research it later.
As I couldn’t install gobjc and I am afraid of not have time to port the game to Windows, I will use Java instead of Objective-C
Instead of Cocos2D, I still don’t know what I will use instead. Loooong time ago I was very good on Java and know how to use java2D and java3D API very well. I don’t knot today (so tomorrow I will try some warm up to remembers things).
To secure that my code will work, I will try to use TDD techniques using JUnit and JMock.