Usain Bolt has literally run 100 meters faster than any human in history. On May 31, 2008, the 21-year-old Jamaican sprinter Usain "Lightning" Bolt broke the 100 meter world record with an official time of 9.72 seconds (with a favorable but legal wind of +1.7 m/s). Bolt lowered the previous world record of 9.74 seconds, set by compatriot Asafa Powell in Italy last September. Video below.
The world record holder of the 100 meter dash is generally bestowed the title of "World's Fastest Man." Although it really depends on the length of the race, that is an amazing title to have. I look forward to seeing Bolt at the Beijing Olympics.