Hi Terrence, et al. FYI. Apress has released (ebook now, print soon) "Pro DLR in .NET 4" by Chaur Wu. ANTLR makes an incidental appearance in Chapter 9, where the CSharp2 target is used to implement a small helper for gluing together host languages. That's all I know. I may have time to skim the book in the next couple weeks. Kyle