Did you think the search engine wars were over, and Google won? New kid on the block Blekko, currently in closed private beta, urges you to reconsider. Once out, it's bound to become the favorite of search refiners, with the results likely made available as an API.
Microsoft continues to built out its cogitative services API portfolio with two more APIs now generally available. The Bing Custom Search API and v7 of the Bing Search API are both GA and ready for production use. The Customer Search API enables targeted searches, and v7 adds filtering.