UI/UX References for Developers

I'll add all of Edward Tufte's books, which are excellent both in content and presentation. The Humane Interface by Jef Raskin was also formative for me.

They complement each other well; Raskin being more technologically/psychologically oriented and formal, while Tufte takes on information design in general at a higher level.

And I second The Design of Everyday Things by Don Norman, it should be required reading for anyone designing anything used by humans.