Check this out for the most up to date list of links on Foley Library's Delicious account
American Physical Society - <http://www.aps.org/>
American Institute of Physics - <http://www.aip.org/>
Amusement Park Physics - <http://www.learner.org/exhibits/parkphysics/>
Calculus-Based Physics: A Free Physics Textbook, by Jeffrey W. Schnick - <http://www.anselm.edu/internet/physics/cbphysics/index.html>
Institute of Physics - <http://www.iop.org/>
Laws of Physics from Alcyone Systems - <http://www.alcyone.com/max/physics/laws/>
Louis A. Bloomfield's How Things Work - <http://howthingswork.virginia.edu/>
MIT's Net Advance of Physics - <http://web.mit.edu/afs/athena.mit.edu/user/r/e/redingtn/www/netadv/welcome.html>
Physics Central (from Americal Physical Society) - <http://www.physicscentral.com/>
Physics.org - <http://www.physics.org/>
Physics Web (from Institute of Physics Publishing) - <http://physicsweb.org/>
UC Berkeley Physics Department Demos - <http://www.mip.berkeley.edu/physics/about_demos.html>
WWW Virtual Library-Physics - <http://vlib.org/Physics>