NBC has the biggest problems of the major networks. They had a lot of weak programming (including five nights a week of The Jay Leno Show) and so will have a lot of slots to fill next season. They’ve already renewed several borderline shows and let a lot of others go.
Here’s a listing of NBC TV shows with their current status. This list encompasses shows that have aired from July 1, 2009 through June 30, 2010.