Most interesting WEB pages on physics

[Barnak]

I'm looking for a list of the most interesting pages on physics, on the internet.

By "most interesting", I mean pages which are rigorous, well done graphically, and no discussions boards/forums and NO crackpots ! It could be simulations applets, papers, Wikipedia articles, etc. I prefer things on relativity theory (special and general), or on electromagnetism, but it could also be on classical mechanics and quantum mechanics, as you prefer.

What are your suggestions ?

 

[M Quack]

The Bilbao Crystallographic Server

http://www.cryst.ehu.es/

Everything you ever wanted to know about space groups, crystal symmetry and so on. And then some...

 

[DennisN]

Hi! I really don't know which level you are after, but here are some I remember...

Hyperphysics has a great scope IMO. Could be made more beautiful, though.
http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

I like the Usenet Physics FAQ too, but graphically it's very basic .
http://math.ucr.edu/home/baez/physics/

Have to mention Wolfram MathWorld too, even though it focuses on mathematics.
http://mathworld.wolfram.com/ There are physics in there as well, e.g. Lorentz Transformation.