Yahoo SearchMonkey

Yahoo's SearchMonkey was less of a consumer service, and more of a tool for developers to make search results look better using structured data. For instance, if you were searching for a restaurant, a site like Yelp could use SearchMonkey to have it show any related photos, as well as list things like the aggregate user rating, the phone number, and the hours of operation--all in a tidy format.

The idea behind that lives on with publishers simply adding listing information in a standard format that can be picked up by multiple search engines. What really went the way of the dodo were the custom result applications, which would let users pick the ways they wanted to restructure results data.