I've been playing with Leopard, the new Mac OSX since Friday and so far, I'm experiencing quite a few performance hiccups which dragged my productive day down. But all that's been blown away by the geekiness factor of the effects in iChat AV. They were already pretty cool, but already an enterprising FX programmer has created some unofficial additions. This is me as a blue ghost - when it's live video, it's ultra cool. Follow this thread for easy instructions on how to install.
Stumble This
Reddit!
It sure scared me!