Nsyght

Nsyght is a search engine which uses your bookmarks and your friends bookmarks to personalize your search results. It pulls information from a number of sites including Del.icio.us, Twitter, Last.fm, Ma.gnolia, Digg, Pownce, and simpy. Their offices are based in London with a development office in Eastern Europe. Quotes:

• • "Nsyght is a totally new social search engine with a lofty goal, of giving you the user the ability to create your own custom search engine using your social network. Every time you bookmark a site, or add a new friend to your network, we know a little more about you and what you consider relevant. So the more knowledge you share with us, the more refined and personalized your search will become."
  • --Nsyght Blog