Backward compatibility is coming to Xbox One, and Microsoft have listed the first 21 titles from their previous console that will be playable on their latest console.
Digital titles will appear in the "Ready to Install" section of your Xbox One "My Games & Apps" menu. For disc-based titles, just put the disc in the drive and a digital version will be downloaded. You WILL need the disc in the drive to play it, though.
Without further ado, these are the games that will be playable by Xbox Preview Program members starting today...
A Kingdom for Keflings
A World of Keflings
Banjo Kazooie: Nuts 'n Bolts
Geometry Wars Evolved
Perfect Dark Zero
Super Meat Boy
Toy Soldiers: Cold War
Viva Piñata: Trouble in Paradise
More titles will be added in due course.