Looks pretty cool, although it makes my N cpu y.yGHz machine crawl. It's sad that 10 years ago(?) people where doing this kind of things with java applets and it actually worked better.
EDIT: I initially tested with konqueror. Now with chrome , it's faster, but I found some strange behaviour when closing windows, as it makes some of the other windows jump to a different position.
10 years ago people were still using Chime. Then Jmol arrived and instead of having to install a proprietary browser plugin, we could wait 30 seconds for the JVM to load. Now we just need some more 3D acceleration for Canvas and we can eliminate that wait as well.
EDIT: I initially tested with konqueror. Now with chrome , it's faster, but I found some strange behaviour when closing windows, as it makes some of the other windows jump to a different position.