NY Mag's Vulture has a great feature with David Cross on All His Roles that you should take some time to read through. From his limited time as Twangly Jackson all the way up to his latest role as Todd Margaret, they cover all the major points... including his role in Alvin and The Chipmunks (love his response to that). The one thing that seemingly overlooked? His role in Scary Movie 2... would love to hear his take on that.