Microsoft Surface shows up again in episode five of Under the Dome as a way to communicate between the dome even though pieces of paper work just fine. A touching moment between two lovers made silly by Surface showing up. Microsoft is a sponsor of the show, but moments like these make you think you're watching a commercial.
As always, don't buy the product mentioned or they'll keep advertising the same way, consider getting alternatives or e-mailing the company and telling them not to be in your TV shows and movies.