The Super Aguri shoulder wings
I mentioned in my Super Aguri update that the definite bodywork on the SA05 featured "somewhat inexplicable shoulder winglet". That was based on photos from their shakedown test at Silverstone before they packed up the cars for the trip to Bahrain. With the cars being stripped down and reassembled in the garages there, I can see that this shoulder wing was supposed to have a larger BAR/Toyota like vertical fence on it.
In the picture here you can see the car as it was at the Silverstone shakedown test in February and on the right the car in Bahrain. Looking more closely at the Silverstone picture now I can see that they've taped over the end of the winglet where the screw holes are. Mystery solved! :)