Just finished HL2 for a 4th time and I'm trying SMod for HL2 that has insaneley increased difficulty and much much much more combine that spawn at places you least expect them to be... They now even use something called aiming... Lolz. Sometimes you can be surounded by as many as 20 uber combine soldiers and they keep coming. Smod adds something called bullet time. It's kinda like in F.E.A.R. but better. The effects are sooo awesome and it enables you to dodge bullets and slow down time. I'ts handy when you're against 20 combine. The mod also has some easter eggs like the guy that says "pick up that can" burns cus his bludgeon touched a gas tank. The mod also has extreme gore effects and special physics if you want. Every feature is configurable. The Mod comes with 20+ new weapons. Really great. Here are the links if anyone is interested. BTW the site doesn't offer much support so I suggest you reading the support link.
Download link: http://kh0rn3.googlepages.com/home5
Support link: http://vergeh.livejournal.com/
Download link: http://kh0rn3.googlepages.com/home5
Support link: http://vergeh.livejournal.com/