I stopped updating this guide in February 2003, after eight years online. I plan to leave it online for the foreseeable future and hope that enough links are still alive to make it useful.
I know that the guide contains many dead links and omits many valuable new sites. For a comprehensive, well-organized, and up-to-date guide to philosophy on the internet, I can recommend Tom Stone's EpistemeLinks.
PhilSci Archive.
Preprints in the philosophy of science.
From the Philosophy of Science Association and the Center for Philosophy of Science at the University of Pittsburgh.