Yea, it's out now! At least the singleplayer part of Half-Life: Gold.
Have fun and stay tuned; Half-Life: Gold Deathmatch will be released soon.
Visit http://www.xen-raiders.com/news/?action=show&id=11 to download.
Visit http://www.xen-raiders.com/sites/?show=7 if you don't know anything about Half-Life: Gold.