Mind42: online collaborative mind-mapping
So i've written before about how much i love mindmapping software, such as MindJet, or the open-source FreeMind. I recently stumbled across a web-based mindmapping site that is truly excellent.
It's called Mind42 and it's free, at least as of this writing. It's ultra "web 2.0" and it feels quite like a desktop app. You can attach notes, files, and links to nodes of your mindmap. You can open it up for collaboration and allow other to shove your mind-map around.
It will import a wide variety of other mindmap formats, including FreeMind files. In my usage, the FreeMind map came across with no loss of fidelity. It also allows easy publishing of your mindmaps to the web, letting you send a url to anyone you want to view your mindmap without installing any software or downloading any files.

