I randomly came across this site while surfing the web looking for pictures of supercells and tornadoes as I love weather photography.  This guy updates this site often and I have even bought a print from him of a supercell which is a 16" x 20" and looks really nice.

He also writes about all of his chases and includes pictures in those which are really interesting.  Believe me I don't know the guy but he does some good work and has incredible shots and links on his site.  I just figured since we are in the middle of severe weather season I would throw out a good site you should check out.