I guess no one can ever say that the VS dev team isnt responsive.. after all the posts in various forums about the lack of support for class libraries on the AD surface, this has now been made available. Unfortunately its only available on Orcas Beta 1 (as a Power Toy) . Check out the post and screenshot at : http://blogs.msdn.com/vsarch/. Apparently Orcas has some underlying infrastructure that allows it to support such out of band developments so this wont work on VS2005 which is a pity, but if we have waited so long, its only another few months to wait for the final orcas release with all these goodies.
Another really good thing is that Steve Cook and Gareth Jones et al have published a new book on Domain Specific Development with VS. It should be available now on Amazon (the link is too long to paste here- check it out).