HTML5 3D demos
mrdoob.com
mrdoob.com
Quake 2 was ported to html5 sometime back. You should have a full html5 compatible browser to run it http://code.google.com/p/quake2-gwt-port/
Just about to think HTML5 is awesome, then I did a right click
Mr. Doob has serious chops.
http://mrdoob.com/projects/voxels/#A/adfShShYhYhSfSfYffhhilY...
Edit: it worked. Yay!
This is very exciting (albeit obvious and long overdue) stuff, IMO.
EDIT: under chrome I can't even tell it's not native.