The Unofficial Stephen Jay Gould Archive includes a wealth of material - many articles on evolutionary biology
The cross-disciplinary teaching program Evo-S founded by David Sloane Wilson, author of Evolution for Everyone
Robert J O'Hara's website including a synopsis of the palaetiological sciences and interesting books, and not least his teaching pages on evolution and significance of Charles Darwin's Origin of Species.
Malcolm R Forster's website contains some superb articles on epistemology, especially consilience. His resurrection of the contemporary relevance of William Whewell makes these articles a critical resource.