Is that by valve or is it a mod?
It's not by Valve. It's by a group of (originally) amateur programmers called the Crowbar Collective. Valve very generously allowed them full use of all the intellectual property in the original game except the name.
Out of curiosity, how do you feel about HL2?
Its free on Epic Games. Downloaded it but haven't tried it yet.Radiohead have made a 'game' digital exhibition using unreal engine. available on PC/Mac/Playstation
This immersive, enthralling adventure in modern art sends you hurtling through Stanley Donwood and Thom Yorke's creationswww.avclub.com
If you like the art work of York & Stanley Greenwood then it's worth checking out. If you hate all things radiohead then it's best avoided I guess.
Have you ever met a gamer with good taste? You havent. Now they think theyre aesthetes