Markus Stöckl broke the mountain bike speed record by riding down a snow covered mountain in Chile. He reached 210.4 kilometers per hour (130.736498847 MPH)! The Wikipedia entry can be found here. The video at Red Bull can be found here (Video link to the right of the article).
Metric to US conversion courtesy of OnlineConversion.com
Update 1: I have corrected the spelling of Markus Stöckl's last name in the title
Update 2: I have updated the speed he attained. It was 210.4 kilometers per hour, not 220.4 kilometers per hour.