Mainly for my own reference here, but if you do Shockwave3D work, the Golden Xp Archive has a tutorial going over the steps to get models and animation from Maya to Shockwave3D.
Currently, we use Lightwave3D for our Shockwave3D development. As long as you don't try to add bones to anything it's very straightforward. Once you add bones, though, things get difficult, so it's good to see that the Maya process is pretty clean. We've got a copy of Maya, so if we start doing more bones-animated scenes, we may have to switch to Maya.