I have only used iPhoto a couple of times by accident (preferring one of the many alternatives). Each time, I carefully removed those images from iPhoto to the iPhoto trashcan and then emptied the iPhoto trash. Consequently, all the iPhoto sections appear empty:
But when I look at the screensaver, pictures show up when one of the iPhoto directories is selected (the directories can't be deleted in any way I know).
I'm assuming that the images were copied into a screensaver cache (or maybe a link was created). Where are these screen saver images stored?
BTW, I'm still running Snow Leopard on a beautiful 4gig iMac. Thanks!