From my husband, Aydin:
Today China boasts over 105 million Internet users, not to mention 350M mobile users (growing by 57 million every year). By 2010, Chinese Internet users will outnumber US Internet users by 25%. Currently, 87% of the Chinese Internet audience uses search. And given Internet search’s dominance of monetization and audience rankings globally, the competition for the top spot in the Chinese search market is pretty intense.
Baidu, Google, Yahoo, Sohu and Sina are battling each other to be the leading provider of search in China. Currently the two largest search players, Baidu and Google, account for almost 90% of the searches (source: CNNIC Search Survey, 2006), per the latest local search market share depicted in the pie chart below.
Read more here.