The 25 richest tech execs in the U.S.

Microsoft cofounder Bill Gates has definitively been the richest guy in Silicon Valley since "Friends" first aired on television. But leave it toAmazon CEOJeff Bezos to dethrone the king and blow the rankings out of the water with a fortune that now tops $150 billion. Although you can be sure that Forbes' annual list of the 400 wealthiest Americans will be loaded with hedge fund execs and investment firm founders, tech executives have steadily infiltrated the ranks and made their way up the char...