Today Valve started to allow stores to start the pre order process on Portal 2, the sequel to the Portal franchise. The game is available on PC, Mac, PS3, and Xbox. The PS3 esition is supposed to have some special features including SteamPlay, which will allow cross platform Co-Op with PC and Mac, and a free download of Portal 2 for PC or Mac once you login to your Steam account on your PS3 copy of Portal 2. Sadly, as we know, Xbox users do not get this feature. Valve has a deal going on now. If you pre order the game, $5 will be taken off the price of the game, bringing it down to $55. Also certain retailers are including exclusive deals with the game such as GameStop, which is including Custom Bots and special skins. The game will be available on April 19, 2011.