Library of the Unofficial Stephen Jay Gould Archive.
Plenty of interesting articles and essays up on the page. I particularly like the Philosophy of Science section, since you can read Popper, Kuhn, Lakatos, and Feyerabend (some of the giants of 20th century science philosophy) to compare and contrast them. Also interesting is Martin Gardner's skeptical critique of Karl Popper (Gardner was mentored by the "chief rival" of Popper, Rudolp Carnap.)
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