Dave Pell and team at Rollyo have relaunched their "roll your own" search engine with lots of new features, and we're proud that Rollyo is powered by the Yahoo! Web Search API. The "roll your own" concept core to Rollyo means that users can easily create search engines that include only the sites they select for the search engine. There are many features beyond the core -- read their About page for all the details.
When presented about Yahoo! APIs at Duke University last spring, I demoed Rollyo and showed everyone the Duke Hoops engine which searches across thirteen different sources chosen by the user -- everything from the local newspaper (Durham Herald-Sun) to major media (Sports Illustrated) to favorite bloggers (http://www.dukeblogger.com/). If Duke basketball isn't your cup of tea, then maybe pop surrealism is what you're looking for -- the possibilities are infinite.
I really love the way Rollyo describes the role of Yahoo! web services in the Rollyo FAQ: "Yahoo provides the engine and Rollyo puts you behind the steering wheel." Nice.