Borderless QuickTime Playback
Even as a long time Mac user, I learn something new everyday. MurphyMac has yet another great screencast covering a unique hack to allow QuickTime to playback without borders, creating a cool floating movie effect. Admittedly, the hack is probably not the most useful for the typical user, but it does make for some some great eye candy and could be really useful for presentations, screen demonstrations, or just plain showing off.
