Windows

GameFAQs - PC
General information, codes, reviews, and FAQs.
http://www.gamefaqs.com/computer/doswin/

GameSpy PC
Offers news, reviews, previews, screenshots, downloads, and a message board.
http://pc.gamespy.com/

GamingMoz - PC
Release data, box art, cheats, and forums.
http://www.gamingmoz.org/games/p48/pc/

Gem's Games
Freeware, shareware, and abandonware. Includes capsule reviews and related links.
http://gemsgames.game-point.net/

Spawn Point
Offers game client downloads, demos, screenshots, and videos. Also includes reviews, servers, blogs, clans and giveaways.
http://www.spawnpoint.com/

World of Free Games
Database of patches, briefly reviewed freeware and shareware, and related links. All files hosted off-site.
http://www.worldoffreegames.com/