A bit late but I’m in.
Well, this will be my second Ludum Dare, but hopefully my first finished game. 
I’ll be using HTML5/Canvas and these tools:
GEdit
Paint.net
And probably jsfx for sound (http://egonelbre.com/js/jsfx/)
I’ll also be using a small framework/engine I made the other day for simple things like sprite drawing and animating.
(this is available here: http://dl.dropbox.com/u/1054134/LD22/LD22.7z – 2.9kb)
Good luck everyone!