Interesting articles for Software Factories
Tom Hollander from Patterns and Practices put together a nice list of articles regarding Software Factories:
http://blogs.msdn.com/tomholl/archive/2007/02/12/software-factory-building-roundup.aspx
If look you down in the details, the integration between DSL and GAT is difficult, but there is help coming:
http://softwarefactoriestoolkit.net/
