Like most people, I read Snow Crash first, and loved it. Zodiac isn't nearly as intellectual as Snow Crash, nor does it have nearly the same depth, but it's tons of fun nonetheless. The protagonist, S.T., is wonderfully realistic, especially if you've ever moved within activist circles. I enjoyed the off-handed instruction in toxic monkeywrenching (how to block pipes, etc.) that echoes so well the eco-classic "The Monkeywrench Gang." Stephenson is a brilliant storyteller, and S.T. is a compelling hero. It's not the most intellectual of books, but great for vicarious revenge against polluting corporations.