Interesting, am I the only one that got into reading Gardner for his debunking pseudoscience? A half dozen comments so far and no one has even mentioned that. My introduction to him was the classic "Fads and Fallacies in the Name of Science". I still have a copy of "Science: Good, Bad, and Bogus".
Actually, I suspect the opposite is more common, as it was for me -- i.e. that it was from reading Martin Gardner that I became aware of the skeptical movement.