tweetVOLUME is another great little twitter tool that you can imagine using for, er, something. via Data Mining.
tools for planners
I've been thinking about making a little list of planning tools recently, stuff that can inspire or help with putting together an interesting presentation or something.
Kuler is a good example, could be just the thing to help you find a nice colour palate for a presentation. Or, if you're looking for decent pictures, this flickr tag browser from airtight might be just the thing. (via, I think, Gareth). And, of course, if you need to give some tedious slides a bit of oomph - there's the generator blog (including geogreeting and the famous cassette generator).
Anyone got anything else?