I hadn't updated my drivers for a while because of the once-upon-a-time Nvidia driver version that fried everybody's cards, so I looked longingly at WebGL portals but was unable to enter. I just updated solely to play in WebGL (everything else was fine before and usually 'If it ain't broke don't fix it.), and it really is remarkable to have smooth-running fully 3d content in one's browser. Here are a few snaps from http://www.ro.me/ which is one of many, many WebGL experiments.
My card is a GTX 275, browser was Chrome.
In this little experiment one may also not just fly around exploring (towed by birds) but also build content.
Here's Chrysaora, a very nice WebGL experiment by http://aleksandarrodic.com/:
posted by - 4:55 PM