Endpoint:

http://socialapi.zune.net/en-US/members/USER_ID

USER_ID:

Either the user GUID or Zune Tag.

Standard feed response format:

<?xml version="1.0" encoding="utf-8"?>
<a:entry xmlns:a="http://www.w3.org/2005/Atom" xmlns="http://schemas.zune.net/profiles/2008/01">
  <a:link rel="self" type="application/atom+xml" href="http://socialapi.zune.net/en-US/members/509cd2cf-9400-4e4c-b3d8-07aa46ce464d"/>
  <a:updated>2011-11-23T05:11:34.1795165Z</a:updated>
  <a:title type="text">ZeBond</a:title>
  <a:content type="html"/>
  <a:author>
    <a:name>ZeBond</a:name>
    <a:uri>http://social.zune.net/member/ZeBond</a:uri>
  </a:author>
  <a:id>urn:uuid:509cd2cf-9400-4e4c-b3d8-07aa46ce464d</a:id>
  <a:link rel="related" type="application/atom+xml" href="http://socialapi.zune.net/en-US/members/509cd2cf-9400-4e4c-b3d8-07aa46ce464d/friends" title="friends"/>
  <playcount>7703</playcount>
  <zunetag>ZeBond</zunetag>
  <displayname>Den</displayname>
  <status>'CAUSE THIS IS THRILLER!</status>
  <bio>I am a developer interested in anything .NET and even low-level coding. Currently actively working with Windows Phone 7.</bio>
  <location>Kansas, USA</location>
  <images>
    <link rel="enclosure" href="http://cache-tiles.zune.net/tiles/user/ZeBond" title="usertile"/>
    <link rel="enclosure" href="http://cache-tiles.zune.net/tiles/background/ZeBond" title="background"/>
  </images>
  <playlists>
    <link rel="related" href="http://socialapi.zune.net/en-US/members/509cd2cf-9400-4e4c-b3d8-07aa46ce464d/playlists/BuiltIn-RecentTracks" title="BuiltIn-RecentTracks" updated="2011-11-18T06:46:40Z"/>
    <link rel="related" href="http://socialapi.zune.net/en-US/members/509cd2cf-9400-4e4c-b3d8-07aa46ce464d/playlists/BuiltIn-MostPlayedArtists" title="BuiltIn-MostPlayedArtists" updated="2011-11-18T06:46:40Z"/>
    <link rel="related" href="http://socialapi.zune.net/en-US/members/509cd2cf-9400-4e4c-b3d8-07aa46ce464d/playlists/BuiltIn-FavoriteTracks" title="BuiltIn-FavoriteTracks" updated="2011-11-23T05:11:34.1795165Z"/>
  </playlists>
  <a:rights>Copyright (c) Microsoft Corporation.  All rights reserved.</a:rights>
</a:entry>