[buymorechuck]

hi5 Networks has more advanced tech along the lines of what you're seeking, though still in private beta, but should be arriving "really soon now". It does a good job of pushing the limits of Flash 10.

If you know Flash 9 already, there is very little documentation that fully explains Flash 10's features other than the Adobe docs and a small number of expert Flash blogs. If no Flash 9 background, better to learn that first.

Flash 10's 3D support is fairly horrid for complex 3D stuff like game-like content without dedicated effort to get around things like lack of depth buffer and buggy matrix math libraries.

Papervision3D and Alternativa are some of the 3D engines out there, but the really good stuff is commercial.