One of the nice things about AutoCAD 2007 is obviously the new 3D features. But one of the things I always found really difficult was setting up materials to apply to the model. I had a hard time trying to find material bitmaps and always ended up defaulting to VIZ or VIZ render to try and use their default materials. Well AutoCAD 2007 comes packed with materials. (Not sure how many, but I thought I heard over 400?). Anyways, when you install AutoCAD 2007 you'll get a bunch of tool palettes with many categorized materials at your finger tips. All you need to do is drag and drop them from the tool palette to your model. Then doctor them up in the new materials editor.