Board Games
Mayfair Games: (http://www.mayfairgames.com/)
Steve Jackson Games: (http://www.sjgames.com/)
Wizards of the Coast: (http://www.wizards.com/)

Collectible & Card Games
Alderac Entertainment Group (AEG): (http://www.alderac.com/)
Decipher: (http://decipher.fanhq.com/)
Wiz Kids Games: (http://www.wizkidsgames.com/)
Wizards of the Coast: (http://www.wizards.com/)
Upper Deck: (http://www.upperdeck.com/)

Comics
Dark Horse: (http://www.darkhorse.com/)
DC: (http://www.dccomics.com/)
Image: (http://www.imagecomics.com/)
Marvel: (http://www.marvel.com/)
Tokyo Pop: (http://www.tokyopop.com/)
Viz Media: (http://www.viz.com/)
Wizard: (http://www.wizarduniverse.com/)

Miniatures
FanPro Games: (http://www.fanprogames.com/)
Forge World: (http://www.forgeworld.co.uk/)
Games Workshop: (http://www.games-workshop.com/)
Hero Games: (http://www.herogames.com/)
Iron Wind: (http://www.ironwindmetals.com/)
Privateer Press: (http://www.privateerpress.com/)
Rackham (in French): (http://www.rackham.fr/)
Reaper Miniatures: (http://www.reapermini.com/)

Role Playing
Mongoose Publishing: (http://www.mongoosepublishing.com/)
Palladium Books: (http://www.palladiumbooks.com/)
White Wolf: (http://www.white-wolf.com/)
Wizards of the Coast: (http://www.wizards.com/)