Well, my wife and I work together, and want to be able to see one another's calendars, so we just opened an Exchange server account with 1and1.com -- it's fairly inexpensive ($7 each per month) and will let us share calendars, contacts, etc. I think it might be a little more complicated to sync copies of both calendars to one Palm (which is what we use), but we may spring for copies of PocketMirror Professional, which has a Palm-side application that can view multiple calendars.