Keeps asking me to delete the movie after I've watched it. Seriously. In my mind it's like watching a DVD, then getting a prompt at the end asking if I'd like to format the DVD to free up space. Sure, I'll take a dirty diaper with my side of fries.
I like the feature... My rewatch value on the iPhone, when I'm going to be syncing again in another few hours, is very very low, so I think it's a nice feature to just delete it once I've watched the whole movie (however I can see that it doesn't really help unless you take a boat load of pics or add a million contacts). But to each his own I guess
I suppose it is a usage thing. For me, I only keep work related clips on the phone to show other people. And they get shown a lot. That constant prompt to delete really gets old fast, especially since it's easy to tap the screen by accident and delete it.