If you've been playing World of Warcraft for any length of time, then you know that there are just some quests you can't do every day. They're too special, too "l33t" to happen all the time. Like slaying the great dragon Onyxia. Or trauling through the menacing dungeon Zul Gurub in search of really rare treasure. But, if you're not paying attention to the spawn schedule of these quests, then you may miss your chance to go on them! And what fun is that?

Fortunately, there's a great widget for OS X's Dashboard called World of Warcraft Raid Calendar that will remind you when a periodic instance raid is about to spawn. It will even display a countdown timer for the most sought-after raids. It works with any Warcraft realm server, and is available as a free download.  Windows users, well, no OS X, no Dashboard. No Dashboard, no Raid Calendar Widget.