Sorry for the confusion. You are correct on your first point: the RadControls for ASP.NET AJAX are a replacement for the "classic" ASP.NET controls. The new controls are built directly on Microsoft's ASP.NET AJAX framework and take advantage of all the benefits the framework has to offer. Among the benefits is superior web service support.
At the framework level, ASP.NET AJAX provides very similar functionality to the RadAjaxServiceManager via the ScriptManager control. Due to this built-in support for handling web-services, the RadAjaxServiceManager was retired in the new suite. You can learn everything you need to know about using ASP.NET AJAX's built-in web service support here:
Some of the RadControls for ASP.NET AJAX also provide direct support for binding to web services, so if that's something you're interested in, let me know. Otherwise, I hope this helps solve your problem.