GX animation framework

See http://ajaxian.com/archives/gx-a-new-animation-framework
Would someone with a better understanding of jQuery's and jQuery UI's
animation features mind taking a look to see what that framework
actually adds that we don't already support out of the box?
Eg. relative animations are promoted, I'm pretty sure we have them already.
In any case, we may need better animation documentation.
Jörn