I've created my own MoinMoin (FOSS python wiki) instance primarily for keeping a development journal (http://wiki.juanl.org/DevLog http://wiki.juanl.org/DevLog)

I've created my own MoinMoin (FOSS python wiki) instance primarily for keeping a development journal (http://wiki.juanl.org/DevLog http://wiki.juanl.org/DevLog). I usually try to capture anything that I spend a significant amount of time figuring out. The fact that it's a wiki makes it great for organizing other ideas too.