"At a conference on Steam and the future of PC gaming at its Seattle headquarters today, Valve announced that it would be introducing a new feature to its digital distribution platform that allows remote storage of all game data for Steam games.

Steam already allows you to play any games in your Steam library from any PC. Steam Cloud will extend that service to game data - examples given were a progress save from Half-Life, or your keyboard bindings and option settings from Team Fortress 2...."