[Shooter]

If you use a Mac, try:

http://flyingmeat.com/voodoopad/

I tried several of the open-source wiki apps, and then was very happy to pay for VoodooPad. I use it and mindmapping apps quite a bit. I bought a notebook app from Circus Ponies, but I don't open it very often. I use DevonThink Pro Office extensively, and it saves me enormous amounts of time. I also use Emacs orgmode and a few other Mac apps that are probably overkill for most people.