It is the kind of event for which cliche sayings like "it's the end of an era" were made. Today is Bill Gates' last day as the chairman of Microsoft, the software company he created and made into an all-encompassing empire. While Gates will remain the non-executive chairman of Microsoft, his full-time job will be with the Gates Foundation, he and wife Melinda's international health non-profit. One of his first stops after bowing out of day-to-day decisions at MS will be to China, where the Gates Foundation is launching a slew of new health initiatives. more ›