I'm not sure if there is a location online where you can download the symbols for Telerik.Web.UI.dll. However, if you download the source code for the RadControls you can very easily build the source code manually and create your own symbol file. The steps are listed in a word document in the source folder. They are pretty straightforward and should take no longer than 5-10 minutes.
Perhaps the devs can chime in as to whether there is an easier way to get the symbols for the controls.
Thanks for your response. That's exactly what I was trying to avoid. It should be trivial for Telerik to host the pdb, but I dont want to get into an endless cycle of building the PDBs myself and deal with any potential mismatched.