BTW, if you have Firefox 3.5 installed anyway right now, here are a few little demos I've written that show off what you can do with a modern browser (they're pretty unpolished, but you'll get the idea). They could be faster with a bit of optimization, but they're already lightyears ahead of what you can do in MSIE.
Music visualization
Voxel island
Mario Kart
3D Model viewer
Dynamic texturing