title: what is the best way to do a p2p app on silverlight
body: <p>I am building a silverlight app and would like to add p2p capabilities - allowing users to send each other data.</p>
  
  <ul>
  <li>Is it available out of the box?</li>
  <li>Should I wait for silverlight 4.0?</li>
  <li>Do I need a p2p server?</li>
  </ul>