Don't Make me Think: by Steve Krug

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Don't Make Me Think! A Common Sense Approach to Web Usability

This is a pretty solid book. It was recommended to me by a lot of people that I respect so I figured I had to read it. As a bonus, it's quite short. As a minus, it probably could be a lot shorter! Which is ironic since Krug prides himself on having eliminated all needless words.

Regardless, it was great. Especially the chapter about guerrilla usability testing has inspired me to do more of that...