After 50 years of the 30-second spot, "innovations" like infomercials, and product placements, the world of TV advertising is about to go through a massive change. The promise of interactive TV is finally coming to advertisers in a variety of ways. New formats that tie devices together, click-to-act banner ads on-screen, and inventory management systems that maximize available ad space will change the relevance and value of TV-based advertising and point to a more interactive landscape for the TV screen in the near future.