Campaigns
I have worked over the years for a number of companies producing interactive and focussed campaigns for television, print, web and mobile delivery. I worked on a number of infamous TV shows such as I'm a celebrity, get me out of here! and other such top notch telly. However the knowledge of delivering for short periods of high volume isnt as simple as you might first think, especially when it is being done within a live television environment. I also worked on some mobile campaigns for top German motor manufacturers to deliver a simple but informative user experience in response to print and television adverts.
Interactivity
Its an interesting area of media right now as interacting with the audience is such a fragmented but rich experience. In the UK the most successful (and naturally simple) approach has been to get an audience to text in a keyword to a shortcode. However habits are changing, and recent changes in the law and regulation have hopefully educated the market a little more in what is and isnt acceptable. A major television show these days needs to deliver through the broadcast experience to a whole set of channels such as Interactive TV (iTV or Red Button as it is sometimes known), Web, Mobile (text and web), Voice (viewer phone ins), User-uploaded-content (from web/mobile) and so on. This is naturally very complicated and over the next 5 years I would expect the web and mobile channels to dominate as it beceomes easier for users to interact with a live show and when they fully understand the cost of doing so, which is right now a major barrier for uptake.