A user over at the Neogaf forums posted some interesting info on what looks like the possibility of sharing games using the Steam service. In the latest Steam Beta update some interesting text was unearthed.
To check it for yourself, you can update to Steam Beta. Steam > Settings > Beta Participation, go to your Steam/Public/steamui_english to verify.
If Valve adopts this most requested feature, then it’s certainly a bold move in light of Microsoft and Sony’s plans with their games consoles and cloud based services.