Here are somethings i really would like to know :

*How to oriente a object , in dx7 i used mesh.setorientation to rotate the object but also move its axis allong , with this i managed to move my car forward over it's X axis all the time, how to do this in dx8 or replace it with something else
*How to move a light , i know how to create one but how can i move it around.
*collision detection with bounding boxes, guess that could be done but the other two are more needed info