Not sure if you knew this Joe, or even want to use it, but i just learned from reading this http://code.google.com/apis/ajaxlibs/documentation/ that you can link the latest and greatest jquery ui libs from here :

   <script type="text/javascript" language="javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
   <script type="text/javascript" language="javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1/jquery-ui.min.js"></script>
   <link type="text/css" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1/themes/base/ui.all.css" rel="stylesheet" />
   <link type="text/css" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1/themes/smoothness/jquery-ui.css" rel="stylesheet" />

The 1 in the calls is the major of the js version. You can expand it to include the minor and revision as well. As it is, it will request the latest and greatest of the 1.X.X versions. Can also change the theme name to match any of the theme names supported by jquery ui.

At least until it goes to version 2.  It is doing some kind of url rewriting as the .css calls return multiple files, including the images for that theme. I was watching the calls in Fiddler, and it was pretty interesting. The drawback to this, is that there will be multiple calls for these files. The benefit is that you will always have the latest files linked.

Ah, nice. :)