I got a question while speaking with customers at their offices in Kuwait last week about adding the ability similar to 3ds max where you can draw on any face without all the pain of setting your UCS to each face manually. This Dynamic UCS feature has been in AutoCAD since AutoCAD 2007.
You can enable Dynamic UCS at the status bar or with Dynamic UCS by pressing F6 or SHIFT+Z.
You can also as seen in my quick and simple Camtasia produced video use CTRL+ALT to Press and Pull shapes making conceptual 3D modeling much faster. I also enabled the labeling of Axis in the AutoCAD Options to more clearly show the changing of the Dynamic UCS when passing over faces of 3D objects.