Grat thread =D> but in the rear view, the williams car is not FW30 but FW29B, becouse the FW30 has an opening at the back of the enginecover and other things, here is the best picture i coul find of the FW30 from the back
Looking at the difference between the Williams and the Toyota's cockpit side protection. The Williams has nicely sculptured undercuts between the cockpit and the side protection to channel the airflow, while the Toyota looks like no real thought has gone into them with regards to what and where the airflow is going to go.
Looking at bar555 other posts, the cockpit protection on the McLaren, Ferrari and Renault are also deeply undercut, like the Williams.
Note that you should be careful when point out (1) as the power steering plumbing. While it's all a bit tangled in between, the two largest cylinders containing fluid are in fact the mast cylinders of the brake system.