What people want
Here at LCA it seems that some people want shared calendars, so I'm pleaased to be able to tell people that I have spent the last 9 months thinking about and writing a CalDAV server.
While it isn't finished yet (is software ever finished?), it does work just fine with all of the free CalDAV clients that are available, and a number of nice people have translated it into six languages so far.
So if you are at LCA and want to know more catch me at tonight's penguin dinner.