Check out Away3d's homepage, it contains the specs on their latest release as well as a demo called Green Planet. If you experience a choppy frame rate, try using the full screen mode in the bottom right, it seemed to help me.
Papervision and Away3d are no longer alone... engines seems to be popping up all over the place. I just stumbled across a new one this week from Alternativa Platform. Check out the lighting on this demo of a woman's face.
I am enjoying this rush of 3D advances and am excited about it's future. However, even with all of the recent advances, it still has a long way to go. Most of the demos are only impressive because they are done in Flash and not because of their own merit. I would never play the demo I mentioned above if it wasn't done in Flash. Granted it is just a demo, but this goes for almost all of the 3D Flash games I have seen thus far. (Anyone try to play Prison break? Just move around for 30 seconds and see if you don't get frustrated). The only draw is that it is a new technique in Flash. These sites make splashes in the Flash community, but how much does that translate to the actual customer?