Not only a great idea but also free load testing for the playcanvas.com guys. Their appserver appears to have melted: the CTO's hands are currently a blur on his keyboard!
Mixamo.com has a good free Gangnam mo-cap you can apply to any uploaded model. It's actually a pretty interesting service, you can just upload a 3D model and their software will auto-rig it for you, and you can pick any animation to apply to the rig (This dance is one of them). Seems it'd be a great service for indie game devs -- not one myself, but looks fascinating.
Second the vote for Mixamo... awesome service, makes creating animation loops really fun and easy.
We're reworking the animation system in Three.js, so soon you'll be able to make your animations in Mixamo, and deliver them on the web. You can do it yourself with Three.js, or with our help using http://studio.verold.com (though, if you're going to do another Gangnam style, please use a better remix - like https://soundcloud.com/stirling-inch/pretty-gangnam-fly-stir...)
