Dr Neutrino gives answers to "almost all" questions about physics.
The Particle Adventure
Standard Model and the fundamental experiments in physics
+ many interesting informations.
Servtech - The Physics Connection
Facts, interesting demonstrations, problems, jokes etc - about physics.
User88 - A,B,C of Nuclear Science
Explications of the general notions of nuclear and particle physics.
A lot of demonstrative posters and other teaching materials.
Simulations and visualisation of different physical phenomena.
EINSTETN - by American Institute of Physics
Informations about the life and work of Albert Einstein
Many other informations related to Einstein.