If you don't mind working with grammars and parser generators then you might want to look at The Definitive ANTLR Reference: Building Domain-Specific Languages Martin Fowler also writes about DSLs and talks about them in a couple of podcasts.
Let's not forget Addison-Wesley's Domain-Specific Development with Visual Studio DSL Tools.
Manning have a forthcoming book called Building Domain Specific Languages in Boo by Ayende Rahien. S blog also touches on DSLs from time to time.
Check out Terrence Parr's other book, Language Implementation Patterns: Create Your Own Domain-Specific and General Programming Languages.
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