Valve Community

Half-Life2.De covers everything related to Half-Life 2.

F13.Net is a review site that ocassionally covers Valve’s games.

Mod My What covers the modding scene with articles and news.

The Steam Cast is a weekly podcast focusing on topics surrounding Valve, their products and their services. The core of the show focuses around several community discussions in the Steam Users’ Forums.

Nana’s Paradox covers Source games and runs articles and news about maps and mods.

The Sven Co-op Map Database is exactly what the title suggests; a database of maps for Sven Co-Op.

Thinking With Portals is a website dedicated to Portal and its custom maps.

Games On Net is a gaming portal for an Austrailian ISP. It covers lots of games, and has active forums.

TeamFortress2.fr is a French site that covers the TF2 scene.

TotalHL.hu is a Hungarian Half-Life portal.

Mods Online is a news and community forum, with a very active user base.

Gamasutra is a fantastic site for game developers. It covers industry news and lots of interviews and features. The site requires registration but it’s free.