You can the following information from yahoo finance site:
1. today's volume is 11 million vs a daily average of 2 mil
2. BIDU, for a 70% China search engine market, is worth over $34 billion while QIHU, at around 10%, is only $3 bil.
3. BIDU market share for its search service is down 22%
4. Qihu has a security service, gaming service, and searching engine service. In addition, it also has a popular browser called 360 security browser which is No. 1 browser in China.