FlickrBooth works on OS X 10.5 and enables photo upload to Flickr/YouTube from Photo Booth.
iGlasses 2 provides a variety of camera controls for the inbuilt or external webcam.
So the next time one of those cats crawl over my keyboard at night, I can brighten the PhotoBooth photos using iGlasses and upload the photo of the miscreant directly to Flickr with FlickrBooth.