The Hockey Community is a new website that I know is going to be a household name among hockey players in no time. The site allows hockey players to follow arenas in their area. If someone is organizing a game they can post it on the site, and everyone who follows that rink will be notified. This is a great way to organize pick-up games, and a great way for hockey players to get more ice time and meet new people.
It is really easy to sign up, and I already have. It might be a bit empty on the site right now, but they are getting new members around the clock and they have been featured on CBC (and How To Hockey :D)
You can sign up here