This is a little flash animation which makes a nice little mix based on default Microsoft sounds:
http://www.albinoblacksheep.com/flash/noises.php
And then there's the Infinite Cat Project at http://www.infinitecat.com/index.html
It shows pictures of cats watching cats on screen watching cats on screen watching cats on screen... Very cool. I like cats. I used to have a picture of on of my old cat's kittens watching me playing Catz, a computergame with ... cats. It was really fascinated!