2010 stock performance rank: 2
Google's loss was Baidu's gain -- especially when that loss was China's 420 million web users. In March, Google stopped censoring its search results in China and redirected Chinese searchers to its Hong Kong site. The company's market share began tanking -- and there to take up the slack was Robin Li's Baidu. Baidu, which already led the Chinese market, is now a juggernaut. Its end-of-2009 market share of 58% is now up to an amazing 73%. With some 8.5 billion search requests a month, it's poised to overtake Yahoo as the world's second-largest search outfit.