Google Calendar makes it ridiculously easy to share calendars with coworkers, customers and partners. You can share personal calendars, team calendars, process calendars, resource calendars - a calendar for anything you want. PC, Mac, iOS, Android - any web enabled device and you have access to any calendar you need.
You can also subscribe to calendars and anyone can publish a calendar for others to subscribe to.
A great example is this calendar for the World Cup. Follow your favorite teams and the calendar will even update scores as the games are being played.
Odell Brewing even uses Google Calendar to schedule their brewing tanks, resources and schedules. Google Calendar can help you catch your favorite World Cup team and may have played a role in that great beer you have during the game.