Today Jon Udell wrote about his experiences with the Mozilla calendar, which we've been using at home to maintain a family calendar between Julie's Thinkpad running Windows and my Powerbook (using iCal). We also had some discussion of iCalendar on the Seattle Python User's group mailing list this week. Lisa has already posted her comments on the way that Jon's desired scenario is in line with her goals for CalDAV (click for details on how to get involved).

I wanted to add one more tidbit of information. The WebDAV folks are working a searching mechanism called DASL, which is designed to support multiple query grammars. The basicsearch grammar defined in the DASL draft is (unsurprisingly relationally oriented) but there's no reason that you couldn't use XQuery as one of the grammars for DASL.