Just gotta add that the new CS: Source is excellent as well, altho i found myself getting wiped out with my no holds barred gung ho approach!!
You live and learn!
Barely into HL2, ive just come across the head crab zombies after the sewers so thats it! My mate is a lot further on and he says the game just gets better and better if thats possible.
It really makes me laugh when people say consoles are better for FPS games as the mouse/keyboard combo is crap!

I love that combo as it gives you total control and even a chimp could work there way around that.
Most who say halo 2 is better have probably never even played HL2. I have both and think there both great but nothing matches HL2 and nothing will for quite some time i imagine.
Only down side is you need a pretty good gfx card to get the full joy! Some people have stated that you need the top of the range shite which is totally untrue. I have an Ati radeon 9800 pro (128MB) which is top of the range ish!!

and that handles it superbly.
Anyway rant over my girlfriend isnt back till 7 tonight so time to get a few hrs in!