FuseCal currently in alpha, lets you add iCal-based calendars (and a few other formats) to a master calendar, then choose whether all those events, just the ones you pick, or events filtered by keyword will be synced to Outlook, Apple iCal, Google Calendar, or another program.
If this works well it will help to usher in a whole new world of calendar management that has to date been a nightmare.
Via: Lifehacker