Of these, I have read, at least a significant portion of:

    - C Programming Language (2nd Edition)
    - Refactoring: Improving the Design of Existing Code
    - The Mythical Man-Month
    - Programming Pearls

The last two were due to one undergraduate CS professor assigning them.

If you feel you've almost gotten OO, but not quite, then Refactoring is a great book. That one lit up the "ah ha" lightbulb for me.