First, I found this one. The Infinite Cat Project It's cats watching cats, kinda like an infinte reflection in a mirror, except excellently staged with cats. Something like 875 pics sent in by people as I write this. Ah... gotta love the internet. :-)
And the waaaay-too-cute-not-to-post category is cats sleeping in weird poses. If that's not cute enough for you, and you feel like you can take more, check out the 'duets' link on that page.