What's more, PS3 customers will get a free SteamPlay copy of the sequel for PC and Mac. "PS3 gamers will be able to simply drop the Blu-ray disc in the PS3, link to their Steam account from inside the game, and all their Steam friends (on PC and Mac) will be visible and accessible for chat and game invites," explained Josh Weier, Portal 2 project lead. There's talk of cloud-based saved games, so you might be able to access your progress on each platform.
"Working together with Sony we have identified a set of features we believe are very compelling to gamers. We hope to expand upon the foundation being laid in Portal 2 with more Steam features and functionality in DLC and future content releases," said Valve boss Gabe Newell. We assume that last part about "future content releases" is referring to other games, so we might be looking at the first of many titles planned to support cross-platform gaming.