
Down here on the bottom is what is called the cinematic mod. The mod completely changes what the game looks like, for 2004 Half Life 2 looks awesome but with Fake Factories Cinematic mod the game has a whole new breath flowing through it. The mod allows you to use an amazing custom soundtrack as well as change out all the models for every characters .
Here are some links to the games site and the mod
http://orange.half-life2.com/ (its 5 bucks, just buy it!)
http://cinematicmod.com/ (its free, just get it)