Lately, my team has been doing quite a bit of work using the DSL Toolkit. It has been quite a grind, but we've developed some pretty cool abilities.
Now I find that we weren't the only ones struggling and that help is on the way for the guys who start on this path next. Thanks for coming to the party guys!
The dslfactory community posted some great stuff on codeplex: http://www.codeplex.com/DslFactoryUtilities
If you are working with the DSL Toolkit even a little, you should check this out.