Atari 7800

AHS: Atari 7800 ProSystem - http://www.atari-history.com/7800.html
History and images of the system and peripherals.

Atari 7800 Archive - http://www.atari7800.org
Contains instruction manuals, a game list, tips and tricks, screenshots, and scans of consoles, cartridges and controllers.

Atari 7800 Development - http://quadrun.tripod.com/
Homebrew project source code and development kit.

Atari 7800 High Score Cartridge - http://www.atari-history.com/videogames/7800/hsc/hsc.html
Previously unreleased add-on peripheral now available for purchase.

Atari Flashback - http://www.atari.com/us/games/atari_flashback/7800
Recreation of the Atari 7800 which includes 20 built in classic games.

Atari7800.com - http://www.atari7800.com/
Offers news, history, articles, and prototype information.

Classic Games: Atari 7800 - http://www.classic-games.com/atari7800/
History, information, specifications, and items for sale or trade.

Dan B's Atari 7800 Tech Page - http://www.atarihq.com/danb/a7800.shtml
System specifications, source code, encryption information, and links.

Game Winners: Atari 7800 - http://www.gamewinners.com/A7800/
Cheats, codes, hints, walkthroughs, and FAQs.

Mark's History of the Atari 7800 ProSystem - http://www.geocities.com/mrathwel/VideoGames/Atari7800.html
History, information, and screenshots.

Saundby's Atari 7800 Mods - http://www.geocities.com/atari7800mod/
Hardware modifications for power, audio, and S-Video.

The Video Game Critic's Atari 7800 Page - http://www.videogamecritic.net/7800.htm
Contains reviews with screenshots.