With more than a dozen services competing for the same eyeballs, a shakeout is pretty much inevitable, though. Here's our guide to eight contenders with the best prospects for long-term survival. Amazon Video on Demand, Blockbuster OnDemand, CinemaNow, the iTunes Store, and Vudu all rent downloadable movies and sell downloadable episodes of new and classic TV shows. Netflix allows you to stream many older movies and some TV episodes as part of its subscription DVD-rental service. Hulu and Joost are free movie-, TV-, and music-streaming services supported by advertising. Have a look through our in-depth recaps of all, and we're confident you'll never bother checking out a DVD again.