http://www.jhorman.org/wikidPad/
Thought I would share this with everyone. In short it is a more advanced Notepad with some Wiki like features.
If you are making a game and not being half-assed about it chances are you will use some sort of design document. This WikidPad can be used to quicky whip up neat and organized design documents.
With it you can have 1000 different documents all in a neat and organized manner, and you can also link relevant topics to each other for quick and easy access (no need to sift through lots of files, or huge walls of text to find what you want).

It might not be something everyone will find a use for. But it is worth a try!