As you know (if you read my blog) I was at the DSL Devcon last week. Among other things, the Intentional
guys gave a demo (video here
) of their Intentional Domain Workbench. At the time of the demo I was already on the way to the airport, but they gave me a private update about what has changed since I stopped working with them. In the meantime they have released version 1.0 (to their customers) and I have seen quite a bit of progress since when I left. Nice!
Instead of describing some of the details myself, I recommend you read Martin Fowler's blog post
on this topic. As usual, he does a much better job than what I would do, so I defer to him.