Rules of Play: Game Design Fundamentals

The Phaidon Design Classics, although they are not specifically about web interface design, are AWESOME. http://www.phaidon.com/designclassics/ They are great to look over for inspiration and to see examples of products that really pushed the envelope of design forward. BTW, if you shelled out for the box set you would score major brownie points with the CEO ;) as they are very accessible to people who aren't actually doing the grunt/brain work of design. More along the lines of computing, Rules of Play: http://tinyurl.com/554oj5 is a great read. Probably not what you'd want to give your CEO, though. Very inspiring and thoughtful writing.