Along with many other people in this comment thread, Steam is by far the PC gaming leader. I for one am not that good at TF2. I roll the soldier most of the time cause I like to blow shit up. Still it's kinda funny that it took off on PC and not on Xbox or PS3. People play TF2 like a WoW Raid. They take it very seriously. It's a great game and i'm a huge Valve fanboy for letting us PC gamers have a portal to buy and play our PC games with great deals and a big enough system to have all of our friends on it. The best part? Steam is free. Can't beat that.