thepwnerofnoobs :
Exactly how does steam work, or in other words, will it open up my computer to exploits such as SecuRom does?
Nope. All your games are tied to your account. What's great about this is, if you ever have to replace your PC, you just reinstall Steam and download all your games. It doesn't matter that you have a completely new machine because it doesn't tie your games to the machine itself.
That's about it. Steam itself is the DRM and doesn't use any other DRM. Now, if the game you are purchasing via Steam DOES use SecureROM or some other form of DRM, then that's not Steam's fault. That's how the publisher wanted it.
But overall, Steam itself is a great program and doesn't itself install anything malicious. I think it still has a bad rep because of what happened at the launch of HL2, but you know what? That was the first of it's kind and things like this always trip up at initial launch. Now, how dedicated the company itself is to getting the kinks worked out is what decides whether it is a success or failure, and right now, Steam is a
major success and I like it.
And, unless the game requires online play, you can set Steam to be in offline mode and as long as all your games have a status of being up-to-date and they don't require online connections to play, you don't have to be online to play your games via Steam.