iApps quit right after launching

[TwigMonster]

iTunes, iPhoto, Safari, Quicktime... all quit (with no error) after launching. I noticed this after importing images from my digcam into iPhoto.

Any ideas? I've run diskutility, repaired the disk and repaired permissions.

Mac OS X v10.4.9
iTunes 7.1.1
iPhoto 6.0.6
Intel Mac Mini