Dioscouri have just updated their Juga component (Access content) with the CheckRights plugin. Very interesting I must say.
The JUGA "CheckRights" plugin - By using this plugin, you can check whether or not a user has access to a particular URL. You can do this quickly–and easily–just by providing the plugin with the URL and User ID in question.
more info here:
www.dioscouri.com/juga/development/using...ckrights-plugin.html