Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Check in iTunes what are your sync settings for the iPhone, there might be a video section where you define how to sync with your Mac?
 
Mine show up in iPhoto (08) but they won't play unless I right click and select 'show photo'.

They also don't sync back to my iPhone.

Have Apple missed something this obvious or is it a flaw?
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.