There are several Atari 2600 web pages on the net, but this one is probably the best. It has the semi-canonical list of Atari games, lots of manuals and the Atari 2600 FAQ.
All fellow Atari 2600 buffs are invited to feast their eyes on a picture of the highly coveted Chase the Chuckwagon cartridge.
Society for American Baseball Research (SABR).
My softball stats for this season (intramural).