google Trends是google的一向新服务跟可以查搜索量.下面市地址 

http://www.google.com/trends

一个有趣的例子                                                                                                                                        

http://www.google.com/trends?q=%E7%8E%8B%E8%8F%B2%2C%E7%AA%A6%E5%94%AF&ctab=0&date=all&geo=all