Where to get Microsoft.Web.Mvc.dll

That’s the MVC Futures project.

MVC 1.0 Futures:
http://aspnet.codeplex.com/releases/view/24471

MVC 2 Futures:
http://aspnet.codeplex.com/releases/view/41742

MVC 3 Futures:
http://aspnet.codeplex.com/releases/view/58781