This code has been incorporated into a new RouteMagic library I wrote which includes Source Code on CodePlex.com as well as a NuGet package!
I saw a bug on Connect today in which someone offers the suggestion that the PageRouteHandler (new in ASP.NET 4) should handle IHttpHandler as well as Page. I don’t really agree with the suggestion because while a Page is an IHttpHandler, an IHttpHandler is not a Page. What I this person really wants is a new handler specifically for http handlers. Let’s give it the tongue twisting name: IHttpHandlerRouteHandler. Unfortunately, it’s too late to add...