Portal 2 but haven't managed to open a portal from the couch to your local retailer? Xbox Live has the answer, as Portal 2 is now available on Games on Demand, according to Major Nelson.
Apart from GLaDOS and Wheatley's intrusion of Xbox Live, there are some pretty substantial sales going on. This week, a load of Bethesda DLC is 50 percent off, including the "Shivering Isles" and "Knights of the Nine" expansions for Oblivion and every piece of Fallout 3 DLC. Several Xbox Live Arcade games are 50 percent off as well this week, including Section 8: Prejudice, The Splatters, Hydro Thunder Hurricane, Hydrophobia and the excellent Toy Soldiers: Cold War.