The new service, dubbed "NBC Direct," will allow users to download episodes to computers running Microsoft Windows software. The file will contain advertising that cannot be skipped. The episode will not be available 7 days after the show has aired. The new service will launch in a test version in October and be expanded in coming months.
NBC Universal said it would no longer sell TV episodes on iTunes because it wants the ability to sell its shows at a variety of prices instead of the $1.99 standard enforced by Apple.
I guess this would be good if you don't have a dvr.