Seems like Edward and myself are ready to talk a bit more in-depth about what we are working on. We are currently playing around with some thoughts of a service and data contract DSL and try to implement it with with Microsoft's early versions of the DSL Toolkit. A bit of a pain, but the whole story is just evolving...

If you are interested on the Why and also the How of DSLs – not just from a Microsoft-branded perspective - go and read Martin Fowler’s most inspiring article on Language Workbenches.
Also go to an older blog post from me musing about the whole Code vs. Contract first vs. Explicitness vs. Anything-else-in-the-world story and how it relates to DSLs.

This is very exciting stuff (ooops, I was meant to avoid this term :)).