That's right, I dropped the "H" bomb. Knowing how to read the Bible is just as important as reading it. I've heard too many Christians say they read it but don't get it. It's not just a lack of spiritual understanding, it's a lack of a hermeneutic. So...
What are your Big 5 books on biblical hermeneutics?
These are books on biblical interpretation, understanding biblical genres, etc. There is a range from text books all the way down to the very practical for average Christians. Don't list books on biblical languages...that's another list. Don't just list reference books on the Bible either. Go!