I'm also thinking about picking up the second edition of the Dragon Book. I want to learn more about language design and compilers. I know the Dragon Book has it's shortcomings, but I love that the new edition covers JIT compiling and garbage collection, and I'm really just looking for a foundation, not a definitive reference. I can catch up on the latest and greatest via the ACM.
I guess it would have been hard to fit that into 140 characters anyway.
Update: After reading the Amazon customer reviews, I bought Programming Language Pragmatics instead.