Sony Bravia TV sets that can connect to the Internet will come with 12,000 free movies built in -- if their purchasers are subscribers to Netflix. The sets, which will be available beginning this fall, will also offer additional streaming programming from such other websites as Amazon Video on Demand, Demand Media, YouTube, and, of course, Sony Pictures. Netflix movies are also available via the $100 Netflix Player by Roku, several Internet-compatible Blu-ray Disc players, and the Xbox 360 game consoles. On-demand delivery of programs via the Internet is expected to pose a growing dilemma for cable operators who act as both Internet service providers and also as distributors for pay-TV cable channels that compete directly with them.