Yahoo’s response to Google’s universal search is SearchMonkey. Inspired by the JavaScript-based website extension from Greasemonkey it is a Facebook Apps style platform where apps (called “Enhancements”) run on Yahoo’s search results, extending them with structured data. Yahoo allows users to add and remove these apps from their search results through the Yahoo Search Gallery.

Have a look at what it looks like in practice. In this search, Yelp.com’s result in the search now has structured data from Yelp’s search enhancement.