We have two trailers and a batch of screenshots from Fortress Forever, a Team Fortress mod for Half-life 2's Source Engine. The first public version will go live on September 17th - Fortress Forever will be free to those who purchase Half-life 2. Thanks: groovyf.

Half-Life 2 - Fortress Forever Trailer #1 (16.92MB)

Half-Life 2 - Fortress Forever Trailer #2 (150.37MB)