Btw @ wheelchairninja; you say you haven't used any physics at all?? It seems to me that that is quite impossible, but you probably mean using the physics engine, right? Because a single (controllable) moving actor, would require some simplified physics...
Well to the topic, take a look at
www.physicsengine.com too, a very good physicsengine plug-inn specially made for use with 3DGS .....
Cheers