Woo, the collection knows my name! I've been thinking of making something like this for a while, but looks like you made it first. Similar things have been done before, but I don't think I've ever seen a collection of regular layout elements like logos, SWFs, etc (the SWFs don't seem to play, though). Actually contained some things I don't think I've seen before too, like the last Halloween level icons, and those dancing sprites on the main screen... maybe those are custom?
One thing to improve: default level set to display when you click the Levels tab, and why is there no actual medal for the Cat Dynamics page? Overall, great work!
-cd-