These are exactly the two books I was going to recommend. Don't Make Me Think is like the K&R of web UX books, and Designing the Obvious is like a nice web 2.0 companion for it.
Also, I'd throw in The Design of Everyday Things -- see http://www.amazon.com/Design-Everyday-Things-Donald-Norman/d.... It was written long before anyone ever thought of web usability; instead, it focuses on the usability of things you interact with daily in real life. Let's just say that you'll never look at teapots or door handles the same way again...
Also, I'd throw in The Design of Everyday Things -- see http://www.amazon.com/Design-Everyday-Things-Donald-Norman/d.... It was written long before anyone ever thought of web usability; instead, it focuses on the usability of things you interact with daily in real life. Let's just say that you'll never look at teapots or door handles the same way again...