Windows Phone: XML as a source

The post at http://weblogs.asp.net/scottgu/archive/2010/03/18/building-a-windows-phone-7-twitter-application-using-silverlight.aspx is incredibly useful to illustrate how to parse an online XML feed to populate a ListBox control dynamically (including the "bodies" of a Panorama page, which are just ListBoxes).

...and here is a page that may do the same for JSON: http://msdn.microsoft.com/en-us/library/system.runtime.serialization.json.datacontractjsonserializer(v=vs.95).aspx