When Lucent Technologies was spun off from AT&T in 1996, the new company was full of promise. An old-line manufacturer, it quickly became a sizzling hot stock thanks to the emergence of the Internet and the build-up of telecommunications. The stock market was soaring, and Lucent flew with it. Within a few short years it became the sixth-largest corporation in America and the most widely held stock in the country. Yet only months later, Lucent was...