NBC Universal and Apple today announced a lineup of new primetime, cable, late-night and classic TV shows, including primetime hits such as “Law & Order” and late-night favorites such as sketches from “The Tonight Show with Jay Leno” on the iTunes Music Store. iTunes now offers more than 300 episodes of 16 popular TV shows for viewing on a computer or video iPod. Apple also notes that customers have purchased and downloaded more than three million videos since their debut on October 12, making the iTunes Music Store the world’s most popular video download store.