sorting videos on 3GS

I have a mess of video clips saved on my iPhone 3GS. Quite a few of them, on a wide range of topics. I open iPod and select videos, and there they all are, sorted by name. I'd like to be able to sort them into separate folders by subject matter. Kids, motorcycles, business stuff... Is there a way to do that, using the iPhone's native capabilities? Or can somebody recommend a good app that will do the deed?

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