highly readable as always, Joel Spolsky explains simple, but really important interface design guidelines.
I'm referring to the online version of the book here (the paper version is longer). I like the examples and his way of writing, but sometimes I couldn't escape the feeling of "come on, I knew that!". Maybe that's because I read Joel's articles before. As you can try out this book freely, I suggest peeking in there. It's great for the bus or as a gift!