I have been able to identify and resolve the problem.

I have some of my own JavaScript and jQuery in my skin, and hoping to avoid conflict, the scripts began with jQuery.NoConflict() and did not use the $ function.  Apparently, this killed the Telerik controls.

I have removed the jQuery.NoConflict() call, and changed the function calls to $.function() instead of jQuery.function() and now the Admin toolbar and the controls on the Admin and Hosts pages are now working.

Now, on to the CSS variances introduced by DNN 7.

Hi Louie.

The problem was my jQuery code.  I had used the jQuery ,noConflict() function, and then prefixed all of my jQuery function calls with jQuery instead of the $.

I changed:

 jQuery.noConflict(); 
jQuery(document).ready(function() { ... });

to simply: 
$(document).ready( function() { ... });

I have also learned that the best way to get an external JavaScript file into your page is via the use of the DNN Client Resource Management controls.  The example below loads my JavaScript for a module that I am developing.  

Add this to the top of your ascx:

<%@ Register TagPrefix="dnn" Namespace="DotNetNuke.Web.Client.ClientResourceManagement" Assembly="DotNetNuke.Web.Client" %> 

Load the JavaScript file like this:
<dnn:dnnjsinclude runat="server" filepath="/DesktopModules/RMSSocial/Scripts/RMSSocial.js" />