If you haven't seen AirSet yet, check it out. It has this, and tons more. With it, I can share my various group and penrosal calendars online, between outlook, and even on my phone. It totally rules. Maybe google will get this good down the road, but they're probably at least a year off (if ever) to having the sweet functionality that AirSet has.p.s. I'm an ecstatic AirSet customer, nothing else.