There seems to be a lot of noise made about the still camera abilities of the iPhone 4S recently, and for good reason; but let’s not forget that it’s also a very competent filmmaker (and the 3Gs and 4 aren’t slouches either). And if you’re even semi-serious about shooting video on your iPhone, you might want something like FiLMiC Pro, a video-production app with real video-production muscle and features.
If that sounds appealing, put down the stuffing and get it now — because the $3 app is free only through the end of Thanksgiving.