NPR's John McChesney has a profile of Jeff Hawkins. Four years ago, Hawkins changed the direction of computing with the Palm Pilot. Handheld computers — or personal digital assistants, as they are also known — are a huge hit. And Hawkins is still in the thick of the competition, even though he left Palm several years ago. Hawkins is now the CEO of Handspring, and Handspring's Visor is successfully stealing market share from the dominant Palm Pilot.