Wikis are cool and all for group collaboration, but I also really like using them for my own brainstorming.
I am using VoodooPad Lite on my laptop to brainstorm my various ideas. Works pretty well.
The only thing is that it doesn't have revision history and diffs. I love revision history. I want to clean up my current thoughts, but also be able to access the thoughts I used to have.
So for now, I'm using Instiki for that.
What's nice is you can link directly to an Instiki page from VoodooPad Lite, so I can do my quick jottings in VP Lite, but then click to go to an Instiki page if I want revision history.
What I really want is a Cocoa wiki with revision history. Actually what I really really want is a Cocoa revision/diff code framework so that any Cocoa application can easily apply it to a textedit box.