A good read Jeff, thanks for the heads-up.
I've often wondered why 'very' loose freehand sketches appeal to my eye so much! I'm inclined to think that this type of presentation makes my brain work in a different way than it does while viewing a 'polished' presentation.
To understand / appreciate the loose sketch I have to do some visual investigation and I think I enjoy this. There is a certain satisfaction for me once I've scanned / investigated / viewed the total scene and then 'hopefully' understand all being presented. Its akin to view an abstract painting to a certain extent, not that I claim to grasp many of their meanings 
On the other hand, viewing a polished presentation that leaves little to investigation does not give me 'that' challenge and does not draw me in!
I think the 'Styles' in SketchUp go some way to delivery the 'loose' sketch effect and as this feature develops we might see more being developed along these lines.
Mike




