Steam is adding a new feature that will allow you to share your Steam library with up to 10 other people:
Steam Family Sharing allows close friends and family members to play one another’s games while earning their own Steam achievements and saving their own game progress to the Steam cloud. It’s all enabled by authorizing a shared computer.
That’s not quite as exciting as it sounds however, you’ll have to share your entire library, as opposed to a single game, and whilst your library is being accessed by someone else, you can’t access it at all (unless you boot them out). So it’s more of a tentative step, rather than a move towards emancipation of Steam’s DRM.
The service enters beta in mid-September, click the link below to find out more.