It's certainly interesting to film with an jailbroken iPhone with one of the free apps called "cycorder." I've been play around quite a bit with the jelloicious CMOSed based little phone and can only hope that some other developers release some better software soon for more control or at least locked exposure. Right now it seems to record from 8-15fps at a resolution of 320x240. I took some footage and resampled it to 1080p and downrezzed it to 720p with some color correction and put it on youtube. You can record anywhere with this and can have up to 7GB of continuous recording or more depending on your phone version. Its not usable for anything serious, but always having a camera ready is nice
iPhone video test
YouTube - iPhone Hack HD video capture test 2 - High quality 720p