Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Must read for web authors!

Steve Krug communicates his savvy approach to web design and navigation clearly and succinctly using great examples. He sets up best practice maxims which are pretty much indisputable and there's a great script at the end for one-on-one web-testing.Easy on technical mumbo-jumbo, big on strategy for making your site accessible and easy to navigate - if the user has to try and guess navigational options, Steve would say you're not doing very well as a designer.Read it!