title: why use javascript routing?
body: <p>There seem to be many libraries and packages (Crossroads.js, etc.) which support this javascript routing functionality, but I'm having trouble understanding a scenario where this is valuable.</p>
  
  <p>Anyone care to go soup-to-nuts on situations where this is useful?  </p>
  
  <p>My background is with ASP.NET (web forms) programming and some amateur javascript/jquery.  </p>