Formerly known as the xxx LANL archives, now hosted at Cornell university; the definitive source for preprints in physics and mathematics. The latest and greatest preprints in theoretical physics. Scanned preprints; might make your eyes hurt and but it saves a trip to the library. An online journal offering reviews in all areas of gravitational physics. Princeton, New Jersey. At the University of California in Santa Barbara. The Search for Extraterrestrial Intelligence. We've given up on Terrestrial Intelligence. A open, free online encyclopedia. Eric Weisstein's World of Science. Hosted by Wolfram Research. Need a quick million dollars? Solve one of these seven problems from the Clay Mathematics Institute in Cambridge, Mass. Recognizing outstanding achievements that cannot or should not be reproduced. Physics news, jobs, and resources. Published by the IoP. I don't know how official it really is, but it has some good information (and some wrong information too). Award winning site on particle physics. One man's quest to cleanse the world of pseudoscience. It's a tough job, but somebody has got to do it.