The MP3 Trigger I helped design with Jamie Robertson is featured (somewhat) on The Late Late Show with Craig Ferguson. Grant Imahara from MythBusters designed the robot and used the MP3 Trigger for the audio feedback. Other SparkFun parts were used. He also hints some "similar circuitry" is used in the new generation of the Energizer Bunny (see 1:51)!
The MP3 Trigger controls the audio responses. Grant loads a MP3 on a microSD card, then when a signal is applied to the board, say a button press, one of the tracks on the SD card plays, simple as that. The magic is in the firmware design by Jamie Robertson.
The MP3 Trigger is the red board on the right. Looks like there is a Futaba RC receiver that probably controls the movements of the robot wirelessly, just as you would control a servo in a RC car or airplane.
Oh yea, SparkFun's AVC is this Saturday.