The Web site's digital entertainment offerings will include webisodes for "Chuck," "Heroes," "30 Rock," "The Office," "Kath & Kim" and "My Own Worst Enemy."
"The Office" also will feature microsites for Andy and Angela's wedding planning and for Serenity by Jan, as well as a new Meredith blog.
"Chuck" will introduce Inside Buy More, an interactive social network, while "Heroes" will launch a special heroes-versus-villains social network in October.
Visitors also will find behind-the-scenes content for shows such as "Crusoe" and "Law & Order: SVU," trivia, polls, games, galleries and featurettes, in addition to "Lipstick Jungle's" Web-only magazine Bonfire
"NBC.com's content offering continues to grow exponentially—there is truly something for everyone. The fans are interacting and having fun with their favorite NBC shows as they've never been able to before," Vivi Zigler, president of NBC Universal Digital Entertainment, said in a statement.