Just released the alpha version Jumpland Underground yesterday (built from my entry in the last LD), so I should have time to make something next weekend. This will be my second Ludum Dare (probably doing the jam again to avoid stress).

Here is some of what I might use for the jam:

• Engine – Unity (version 4.5, unless 4.6 comes out in time) (4.6 beta!)
• Language – C#
• Art – Paint.net, Inkscape, and maybe GraphicsGale
• Sound – Bfxr and Audacity
• Music – abundant-music.com, LMMS, and Audacity

Good luck everyone!