Quick note
On 01.01.2010 I will publish an interesting article. Which could be useful for 3D programmers. Iam not quite sure how “practical” this is. Or something like this exist. (As far as I know, it dont )
It will explain, how you could send the information about an player: Where he is ( In X,Y,Z ) And in which direction he looks. Normally also ( X,Y,Z ). With just three numbers 
This system could be used on 3D models, to reduce the information. ( Size )
