iPhoto doesn't recognize iPhone

Hi everybody,

I have a really annoying problem with my iPhone here.
When it is connected to my Mac, and I open iPhoto, it doesn't show up in the list of devices and that means I cannot sync my photos taken with the iPhone anymore.
I tried rebooting (Mac and iPhone) and resetting the iPhone, but nothing seemed to work.

Is there anyone out there with the same problem or a good solution ?

Thanks !

P.S.: I use 10.5.6 on my Mac and iPhoto 8.0.1