Nielsen has issued a year-end look at the most popular trends among Americans during 2008, covering everything from the top TV programs to the most popular consumer packaged goods.
Up first: movies and DVDs. 
Action and adventure ruled the box office in 2008.  “The Dark Knight,” “Iron Man,” “Indiana Jones and the Kingdom of the Crystal Skull” were the top three box office earners this past year, taking in a combined $1.16 billion through December 7.
Among DVD releases, action and adventure flicks also fared well, with “Iron Man” and “I Am Legend” …