I have just released the beta build of CassiniDev.VisualStudio, a fully compatibly drop in replacement for the Visual Studio Development Server (WebDev.WebServer.exe)
Why?
Myself and others have found over the years that while WebDev is a reliable development and debugging companion is falls a bit short in some areas including serving the correct content-type for many file types and the lack of discoverable logging.
These issues and more are now covered in CassiniDev, including the Visual Studio builds.
But the most attractive reason to replace WebDev.WebHost with CassiniDev is the ability to further customize the behavior and functionality of your development environment with relative ease.
Check it out and download it here: http://cassinidev.codeplex.com/