If you are looking for some fun free mac software check out voice candy on the Mac Heist website. In order to get the free version you must have a twitter account and tweet about Voice candy. Mac Heist will walk you through the easy steps to downloading your new wares. Voice Candy is a program that can change your voice to a Robot, Darth Vador, or even a Chipmunk. There is glorious amounts of time wasting to be done with this application. Normally Voice Candy cost around $12 so get it while it is free. Enjoy!

Here are some examples I created from Voice Candy:

Chipmunk:

Vador:

Robot: