There are a lot of good physics libraries and examples out there, such as the Fisix Engine, . But I just stumbled across a couple new ones: www.feedthehead.net, www.acrobots.net, and this monster truck demo (with source). Feedthehead has some fun easter eggs as well; for example, try pulling off the nose multiple times.

With the performance increases in AS3, new developments in Flash 3d and continual growth in the Flash physics world, I imagine the quantity and quality of flash games will start becoming the “new wave.”