Figured in the interest of organization, and since this will be on Stan's 2.0, it might be a good idea to start up this thread. If you're looking to download the game you can find it here:
Link no longer points to a working download page see one post below for third party sites until steam begins distributing it. (make sure you get the HL2 version and not HL1 :smile:)
The installation process will likely be changing once they add the mod to steam so stay tuned for that one.