While many people moan about things that didn't get fixed, I'm somewhat concerned about the things that the 10.5.7 update DID fix that I didn't know about.
A bit of background: For about a year I've had a Logitech Webcam. It was designed for the Mac, and was meant to replace the iSight firewire webcam that Apple unceremoniously discontinued.
The Logitech unit, a Quickcam Vision Pro for Mac, has a wonderful crisp image and a nice wide angle view. It is plug and play. That's the problem. As some other users have seen, its internal aperture adjustment sometimes goes haywire, and you have to unplug it, and re-plug it in again to get a picture that is not really, really dark. It's kind of plug and play, then unplug or don't play. Then plug it in again.