A Paint.NET FileType plugin that takes an image that contains sprites on multiple layers and lays them out into an evenly spaced spritesheet.
This is one of those cool things that I would never find again if I ever needed it (Shut up...you never know... I could write a game or app that needs something like this. So I can't draw my way out of a wet paper sack, with holes on both sides and instructions on the side...I could... oh hell, I'll never use this... but hey, YOU might! :) Plus I just like too see people releasing source for cool Paint.NET plugins. (So there!)