Lee la PRIMERA pagina antes de preguntar.

Algunas buenas noticias en :

http://www.steampowered.com/index.php?area=news

"Offline/LAN play
Work on offline/LAN play is now nearing completion. To play any Steam game while not connected to the Internet it will only be necessary to let Steam finish downloading all of that game’s content, at which point you’ll be able to play games without connecting to Steam."

Al fin la opcion de LAN esta cerca ;)