To attract fans to view games that are already broadcast on network television, NBC will have a number of extra features available online including additional camera angles, in-game highlights, picture-in-picture technology, live statistics and other interactive elements.

Sunday Night Football Extra will start today with NFL Kickoff 2008 with the Washington Redskins at New York Giants.

"In the first two seasons of NBC Sunday Night Football we created a new destination to reach viewers and changed traditional primetime football viewing habits," said Dick Ebersol, Chairman, NBC Universal Sports & Olympics.

"Now, together with the NFL, we are adding the live streaming element where users can interact with the broadcast to enhance their experience."

Some of the extra online features include multiple camera angles that viewers cans select to watch and "star cam" which is a camera that follows a star player. Picture-in-picture technology will allow fans to watch multiple video streams at the same time and in- game highlights that allows fans to access highlights on demand.

The NFL says that Sunday Night Football Extra is a one-year experiment to gauge fan-viewing habits.