I posted my comment right before spotting your question... I Used a trick like that to be able to load my posterous posts with JSONP. http://zbyszek.posterous.com is loaded as content in http://naugtur.pl
http://zbyszek.posterous.com - the theme for this, did you create it? It's neat. There are a pair of forward slashes at the beginning of the page though. In Chrome at least.
http://naugtur.pl - Love the categorization and of course the animation. What are you using to do the animation?
Thanks~
As for animations - It's just a CSS transition definition and a single rule to rotate and scale an element. I created a hack that makes the CSS rule apply recursively. fun.js has some code that converts the simple html into a deeper structure.
I think someone else got the idea of _recursive CSS_ first, but it was used for drawing shapes as far as I remember.