Books I can read online

• Structure and Interpretation of Computer Programs, which, while broad, it does focus somewhat on metalinguistic abstraction
  • read online here
• Language Implementation Patterns: Create Your Own Domain-Specific and General Programming Languages
  • available, ahem, in disreputable places

Books I'm considering getting

• Generative Programming, 2000
  • website
• Principles of Programming Languages, 2010
  • [1]
• Programming Language Pragmatics, Michael Lee Scott, 2009

DSLs

• Domain-Specific Languages (Addison-Wesley Signature Series (Fowler))
  • this book is sweeping and expansive in its coverage
• DSLs in Action
• Language Implementation Patterns: Create Your Own Domain-Specific and General Programming Languages (Pragmatic Programmers) (TOC)