Are you looking for information on writing compilers as well, or just language design? If the former, I suggest Modern Compiler Implementation in (C|Java|ML) by

Are you looking for information on writing compilers as well, or just language design? If the former, I suggest Modern Compiler Implementation in (C|Java|ML) by Andrew Appel, as well as the de facto `Dragon Book' (Compilers, Principles, Techniques and Tools).