Valve was kind enough today to show the progress of their much anticipated sequel to one of the best PC games ever---Half-Life 2. The demo wasn’t so much for showing off earth-shattering news about the gameplay, but rather just to give folks an idea of their progress since last E3, and for the developers to show snippets of some of their favorite moments from beta testing as well as give hints about the beginning of the story. Valve’s Eric Johnson, of Valve, was on hand to provide explanation for the scenes we were about to witness.