Funny stuff. There should be a website dedicated to Photobooth.
I love my MBP photobooth too. I recently started up a iChat session on my Powermac G5. I have not used my camera in over 6 months. Anyways, the quality was terrible in comparison. I don't care if they ever provide Photobooth to older Macs. It won't be as good with the weaker iSights.