Hitwise tells you secrets about your competitors

Have you ever heard of Hitwise? It claims itself as a competitive intelligence and search intelligence source for online advertising and search marketing. It is totally ture. Yesterday I just got a short training from its account manager and totally fall in love with this tool now. Basically, it collects web browsing data directly from ISP servers and actively monitors 1 million websites traffic in US. (It also cover UK, HK, and several other countries.) Then it categorizes, reorganizes, analyzes, and finally presents those data to you. You can select your competitors in a specific category and see their traffic data. Most valuable, it can tell how much organic/paid traffic your competitors get, where they get it, and what top performance keywords are. It is amazingly useful when to design a SEM campaign or conduct SEO activities. I believe there are more functionalities lying on this cool SaaS. I will tell you more in my "SEO Toolkits" section after I play around with it.