A newsgroup post on the Principle of Archimedes  

AB50  -  50 Yeasr of the Aharonov-Bohm Effect  -  Congress at the Tel Aviv University  -  The seminal paper of 1959      

The Niels Bohr Institute of the University of Copenhagen  

SYMMETRY - a joint  Fermilab / SLAC  publication  -  an online and paper periodical on particle physics
started October/November 2004  -  supported by the Office of Science of the U.S. Department of Energy  

National Institute of Standards and Technology (NIST)  -  Physics laboratory  -  Atomic Spectra Database, part of Physical Reference Data website

Several different calculator programs related to water treatment (with thanks to Lenntech, a spin-off company from TUDelft)

Isaac Newton: Philosophiae Naturalis Principia Mathematica Volumina I et II -
1833 edition by T.Leseur and F.Jacquier (xxxii + 755 pages)

Dark Energy  (July 21st 2008)