As a Chinese, I have to say that QIHU is a real competitor for BIDU. Only one reason: its absolute big number of free-anti-virus users in China. It can easily use this advantage to compete with other players in Chinese IT industry. That is why QIHU is so agressive recently, for example, its famous lawsuits with another Chinese Giant, Tecent. So, don't play down the threat from BIDU.