Ixquick states they are the world’s most private search engine.Thanks. Interestingly, the home page of ixquick and startpage look very similar. Probably because they are related. From here:
Startpage, and its sister search engine Ixquick, are the only third-party certified search engines in the world that do not record your IP address or track your searches.
Apparently the difference is that startpage gives you just results from Google and ixquick does not.