Harvard
Harvard Physics
Harvard High Energy Theory

Brown
Brown Physics
Brown High Energy Theory

arXiv.org e-Print Server
SPIRES Database

Eric Weisstein's Treasure Troves of Science
New York Times ScienceTimes : Reality = NYTimes - Hype

Atom in a Box : Hydrogen orbital visualization software.
TeXShop : A wonderful, intuitive Mac OS X version of the LaTeX typesetting program.