There are already several second-screen apps available for specific shows and networks, but what sets Zeebox apart is the backing of NBC Universal, HBO, and Comcast, giving it the capability to be the second screen for all your TV watching. It also acts as your guide for planning your TV viewing throughout the day, with listings in your area for whichever service (even outside the companies listed) you use.
To check out the features in Zeebox you can sign in through Facebook or Twitter, or you can bypass the social networks initially to get the lay of the land. I chose to skip the sign-in, but it quickly became clear to me that the social connection is a neat way to share with friends while getting show recommendations from people you know who are also on Zeebox.
At the top of the interface, Zeebox has buttons for What's Hot, which gives you the shows being talked about currently; the Guide, to look at listings from your local cable or satellite service for the entire day (extremely useful); and Activity, for shows being watched currently by other Zeebox users. Though there's a lot going on in the interface, it's pretty self-explanatory how to navigate to each of the app's features.