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Surf Canyon is an upcoming web search technology that filters your queries and learns your preferences accordingly. This isn't a search engine in itself, but will pull results from other engines like Google, re-organizing them in a manner more suitable for you. The site is not yet live, but is currently in private beta.
When you get your list of search results, they're displayed in a type of mind-map format. You can mouse over a link or click on a target icon in order to get more results that are related to this page. The new, related results will display beneath the original result, and searches can branch out fairly wide in this manner. This is somewhat similar to Microsoft's Tafiti.
All the while, Surf Canyon will take in data of your search preferences and essentially train the system for future use. The way in which Surf Canyon re-organizes web search from existing search engine data speaks to the necessity of engines like Google to provide more qualitative results, which was brought up in a Compete study released yesterday. Other tools include Tileplex and MindMeister.