I use nodewiki [<a href="http://github.com/gjritter/nodewiki/" rel="nofollow">http://github.com/gjritter/nodewiki/</a>] and nerve [<a href="http://github.com/gjritter/nerve/" rel="nofollow">http://github.com/gjritter/nerve/</a>] to power my personal wiki/mindmap sites, and I'm also using node to power the backend of a site that should go public very soon.