I'm working on a tutorial but I need some people to test that this works. Thanks!

Download it here:

http://dnnsilverlight.adefwebserver.com/Silverlight20/SilverlightUsers/tabid/68/Default.aspx

Thank you for bringing this to my attention. I put "System.Web.Silverlight.dll" in the TestSilverlightAdmin_01.00.00_Install.zip file and changed the .dnn file inside the .zip to this:

<dotnetnuke version="3.0" type="Module">
  <folders>
    <folder>
      <name>TestSilverlightAdmin</name>
      <friendlyname>TestSilverlightAdmin</friendlyname>
      <foldername>TestSilverlightAdmin</foldername>
      <modulename>TestSilverlightAdmin</modulename>
      <description>http://dnnsilverlight.adefwebserver.com/</description>
      <version>01.00.00</version>
      <businesscontrollerclass>
      </businesscontrollerclass>
      <modules>
        <module>
          <friendlyname>TestSilverlightAdmin</friendlyname>
          <cachetime>0</cachetime>
          <controls>
            <control>
              <src>DesktopModules/TestSilverlightAdmin/View.ascx</src>
              <type>View</type>
            </control>
          </controls>
        </module>
      </modules>
      <files>
        <file>
          <name>TestSilverlightAdmin.xap</name>
        </file>
        <file>
          <name>View.ascx</name>
        </file>
        <file>
          <name>View.ascx.cs</name>
        </file>
        <file>
          <name>WebService.asmx</name>
        </file>
        <file>
          <path>[app_code]</path>
          <name>IWebXAMLAuthendication.cs</name>
        </file>
        <file>
          <path>[app_code]</path>
          <name>IWebXAMLSupport.cs</name>
        </file>
        <file>
          <path>[app_code]</path>
          <name>Webservice.cs</name>
        </file>
        <file>
          <name>System.Web.Silverlight.dll</name>
        </file>
      </files>
    </folder>
  </folders>
</dotnetnuke>