Stuttering: this indicates a graphics issue or probably a graphics loading issue. Basically, your graphics are too high. I let HL2 configure my settings, and it set them too high. The initial speeches (GMan, then the City 17 administrator in the displays as you get off the train) were stuttering noticably. Cranked down textures and shadows to medium, stuttering gone. Stuttering returns if I have played several hours without a reboot (since Windows isn't very good at releasing memory properly, eating through it during a session). Registration. There is some way to set it to let you play offline without trying to hit net each time; not sure how to do it yet. I also have to look up how to make Steam not load everytime I boot my computer, as that is total BS. It's my computer, not Valve's. This net authentication crap is just that; crap. I am very close to placing Valve on my do-not-buy list, right up there with Verant. Anyone know how to set HL2 for off-line mode now ?