Support the MS CDN (also used for AJAX librabries) as some sort of "global assembly cache"
The Silverlight SDK contains several assemblies not deployed with the plugin. Today we need to package those in the xap file. Microsoft sould put them on the CDN they launched for AJAX libraries, and silverlight apps should attempt strong-named download from the CDN if it can't find an assembly in the xap. This will bring down xap size, speed-up download time and enable reuse of already downloaded assemblies easily.