The market for paid movie rentals from predominantly free video services isn't a very big one. For most of us, it amounts to YouTube and YouTube. Vimeo is planning to shake up that small category with its own pay-to-view service. A just-started private beta stands out mostly through rental windows that won't leave us scrambling for spare viewing time. While there's a 48-hour rental, there are also 72-hour, 1-week and 2-month periods that let even the perpetually busy get through a full showing. Vimeo's current sel
