Hidden Gems in ASP.NET 4.0

Here is a post from Phil Haack about extra extensibility options in ASP.NET 4.0. I would like to emphasize the third "gem", the one that lets you add an assembly programatically to the list of loaded assemblies (equivalent to adding it in the assemblies tag in web.config). I wanted this from .Net 1.0 ! Unfortunately it must be called during the Application_PreStartInit stage of the application, but maybe the first gem can help with that.

Of course, I haven't been using these things yet, so I may be saying stupid things. It is a distinct possibility... Quite distinctive... Oh, shut up!