I found a bunch of sites with static images. Even the ones that claim they are animated seem to be just a static. Sorry
But here's some more static ones incase you were looking for anything else...
louisgray.com: Web Service Logos from AOL to Zuula Get Spooky for Halloween - The Zuula logo is pretty neat.
Halloween Logos 2007 | Logo Design Blog - The yahoo one on this page is animated...