Great New Features to Steam
A few weeks ago, Steams "Greenlight" went live. Greenlight allows indie developers to post information on their upcoming games, get feedback from Steam users and get voted to be released on the Steam service.
Another new feature from Steam is Steam "Big Picture", an updated layout for users who plug their PCs into their TV. It supports both your keyboard/mouse combo or game controller.
Steam Big Picture is currently in open beta. More information can be found here