3Com's PalmPilot is the world's bestselling hand-held computer platform. In three years, its 16 models from 5 different manufacturers have captured 80 percent of the palmtop market. About the size of a playing card, Palm devices are lightweight (under 6 ounces), offering two-month battery life, handwriting recognition, Internet connectivity, and a touch-screen display. Above all, these devices are fast and elegantly designed. PalmPilot: The Ultimate Guide was an instant classic when it debuted in 1998, becoming, and remaining, the bestselling Palm book (and a top ten title among all computer...