title: YAML/JSON/XML: which one to choose on IPhone for communication over RESTFul protocol?
body: <p>I'm writing a simple application that communicates with an external server.
  The server currently supports yaml, xml and json. </p>
  
  <ul>
  <li>Which encoding is fastest on IPhone?</li>
  <li>Which has better support?</li>
  <li>What libraries do you suggest?</li>
  </ul>