Odyssey2

Classic Home Videogames Museum - http://gamesmuseum.h-body.org/history/gen2/odyssey2/odyssey2.html
Information, pictures and FAQ.

Computer Closet Collection - http://www.computercloset.org/MagnavoxOdyssey2.htm
Specifications, information and few pictures.

CVG Nexus: Odyssey2 Trackball - http://home.hiwaay.net/~lkseitz/cvg/nexus/features/gallery/o2tb.shtml
Information and pictures on this accessory.

Magnavox Odyssey 2 Super Site - http://members.fortunecity.com/lakeshorelover/
Reviews, High Scores, and news items.

Projects for Videopac G7000 / Odyssey² - http://soeren.informationstheater.de/g7000/
Dedicated to software development. Contains several example programs, a description of the built-in BIOS and a RAM cart design.

The Odyssey2 Homepage - http://www.classicgaming.com/o2home/
A resource site with information, FAQ, pictures, and reviews.