Before I rolled back my site I tried to install the old one over the new one, and of course failed the version check and didnt install.  I then tried to remove the new telerik module but that made the entire site go bad with webconfig items leading to no where, etc/.  I finally gave up because I didnt want the site down too long (even though it was the middle of the night) so I rolled it back to the preupgrade state.

How did you "Un-install" the telerik extension?

And you just uninstalled but the site ran fine afterwards?

Lucky you. Didnt happen that way for me. I just immediately got "errors parsing the web.config" as there were many telerik entries pointing to nothing. Did you select "delete files"? What exactly did you uninstall? The provider or the library?