From their webpage:
Startingpage (www.startingpage.com) combines the powerful search results of Google with the strong privacy features of Ixquick, the world’s most private search engine. The result is great search results – with total privacy protection!
No IP addresses are stored, no personal data is gathered or passed on to third parties, and no identifying cookies are placed on your browser. Startingpage also offers secure SSL encryption, a proxy option that allows anonymous web surfing, full third-party certification, and numerous other privacy features.