As you might suspect, this site allows you to generate a polaroid-looking image from another image you specify.  There are some limitations on resolution and such, but still pretty novel.

This site basically hosts photoshop contests regarding current news info.  Some of the items are remarkable.  For instance, here's a vampire lizard. :)

Akiyoshi KITAOKA has created a lot of optical illusion images. Man, they mess with your head.

Even has a dizziness warning. :) That means they must be good right?