Entrepreneurs and tech wizards, immigrants and investors, dreamers and visionaries are heading West to seek their fortune.Their Mecca is Silicon Valley - where one person can achieve so much with just initiative, talent and a good idea. Meet David Filo, co-founder of Yahoo and worth over $500 million, who still sleeps under his desk one night a week. Meet the 26 year-old who is already on his fifth start-up venture. Meet the man with the biggest brain in the world. Meet the nudist who works the late shift.