Soundspoof.com Angry Halo 2 Players
Found this the other day after the sight creator posted in the comments of the Halo 2 Profanity Study.
The site is called soundspoof. The creator uses some soundboards and a modded Live headset to chat with other players under the guise of Mr. Rogers, Dr. Phil etc. For more about the site head here.
Some sample recordings:
Josh Smith is a blogger, database manager and adjunct professor of business and technology. 
