This is kinda what I was talking about. AirSet is a web-based service for keeping your PIM data in sync. You can setup multiple calendars, share them with groups, and sync them across platforms. So, for example, I can download their sync client onto my work PC and sync up my work calendar to Airset. I can do the same thing at home (my personal calendar is in Palm Desktop) and both calendars can show up on Airset. Better yet, I can sync from Airset, so that my personal calendar has both work and personal events, but my work calendar only has my work appointments. Airset can do quite a bit more. I've run into a few sync bugs and other minor annoyances but thus far the beta is great!