Announced yesterday at the Social Search Overview session, the Yahoo! Search Builder.
With Yahoo! Search Builder you can create a custom Web search engine by selecting a set of trusted sites to search across or you can tune the search algorithm to the topic of your choice. Beyond Web search, Search Builder includes Site search and News search.
More details at Yahoo! Search Blog and Yahoo! Search Builder Help.
Yahoo! Search Builder at http://builder.search.yahoo.com/
Forum discussion at WebmasterWorld.

Comments:
Tony Hirst
08/08/2006 10:59 pm
I was wondering how come yahoo didn't make use of their delicious acquisition and allow users to use the links form a delicious feed to set the limit on a search (for an example of how this could work see deliSearch - http://blogs.open.ac.uk/Maths/ajh59/deliSearch.html - which lets users identify a delicious feed and then use the sites linked to to limit a search by page or domain - a bit like a feed powered Rollyo. there's also a more genral version - searchfeedr (http://blogs.open.ac.uk/Maths/ajh59/007309.html) which sets limits form any provided feed. tony