If you play WoW on a Mac, and you need to know at a glance whether your favorite server is up, WoW Watcher an open source application does provides an easy and efficient means of tracking the status of multiple realms for the game World of Warcraft. Boasts features of Growl notifications, searchable server list, auto-launch and login, and capable of tracking any amount of servers.

More info: WoW Watcher