I collect anything made by Atari. I specialize in the 8-Bit computer line, but I have now expanded the "Active Collection" to anything Pre-1985, although I buy post-1985 when I can get them. Here are some Atari lists and links.
Atari 8-Bit machines. 
Atari 2600.
5200/7800 Systems. They tried so hard...
Atari ST, TT and Falcon.
Atari Corp's Webpage (Jaguar only)
Other Atari Stuff and Links. 
My Home Page
email: strong@ee.utah.edu