If you visit http://bodybrowser.googlelabs.com/, does it work? In particular, does http://bodybrowser.googlelabs.com/body.html load and let you rotate the body around?

If possible, can you DM me your IP on twitter, so I can see where in the logs you showed up? If it's weird giving out your IP to random people on the internet, you could just visit endlessforms.com / DanielRibeiroDebug , and I'll find the 404 in the log file.