Nowadays online applications like Google or Yahoo! Calendar can easily be shared with other people. If you use iCal on Mac it's not that easy though. BusySync therefore comes in handy, as it lets you sync up multiple iCals to keep everybody up to date on upcoming events. From the BusySync interface, you'll be able to select the calendars you want to share and the rights you want to give to other users (read, read or read & write). Using the Subscribe, you'll be able to monitor when calendars were synced and with whom. If you've been disconnected for a while, BusySync will automatically sync as soon you connect your Mac to your network again. BusySync works with the reliable Bonjour networking to sync iCals. A nice feature to have to share iCal calendars with others.