With Voices [iTunes Link], you're given tools to manipulate your own voice in many fun and odd ways. Whether you'd like to transform into Darth Vader or a chipmunk, you're good to go with Voices. Sporting a unique and very pretty user interface, the application boasts a lot of cool extras sure to show you how hard the developers have worked on it.
The app has a home screen-like selection window where you can choose the way in which you want your voice manipulated. A stack of your recordings can also be accessed with just a tap.
After initially seeing this app when it was in early beta, it has come a long way since then. The app is being published by Tap Tap Tap and is available for only 99 cents. Also, to celebrate the release, MacHeist is offering a special "Tweetblast" deal, giving away a free copy of Voice Candy for Mac to people who help spread the word on Twitter.
Here's some shots of Voices in action: