You go to your favorite Web 2.0 search engine and set up a query like http://web20.example.com/search=john+doe&ouptut=atom and search for "john doe," but rather than getting back results as the usual HTML web page, you get it back in Atom format
Web3S is Microsoft’s answer to a RESTful web publishing protocol. In many ways it attempts to tackle the same problems solved by the Atom Publishing Protocol.