As noted by Macworld, the latest version of Quicktime 7.2 released just yesterday brings new video Export options for the iPhone.
QuickTime 7.2 adds two new export features into the application Export for iPhone and Export for iPhone (Cellular). The former exports a .m4v video, while the latter exports in the smaller .3gp format.
The preset options allow you to export your videos in an iPhone optimized format.