For some time now, it has been possible to imagine a moment when you--yes, You, the "Person of the Year," the ultimate arbiter of cultural relevance--will be able to watch whatever you want whenever you want in the setting of your choice. The handful of Web sites that now offer streaming or downloadable feature films, along with wider video on demand through the cable box or satellite dish, offer a glimpse of what is to come. A.O. Scott reports.
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