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I really wish iTunes would add a rental model for movies. I prefer to buy music, because I listen to songs over and over again (literally 100s of times). However, I don't watch movies more than once except on rare occasions, and I don't think I've ever watched any movie more than 3 times. For that reason, I don't want to buy movies on iTunes, I just want to rent them. Hopefully Apple will add this capability.

As for current offerings for the Mac, I don't know of any but that doesn't mean much as I haven't looked too hard.
 
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