I would love to see a graph showing lateral grip levels from say 1980 to now. The graph would presumably be heavily biased towards downforce but it would be awesome to see exactly what was lost/gained due to changes we know happened.
I.e. Banning of the skirts in early 80's. Banning the wide "white label" Goodyear tires in 1993. Then the massive massive change to the cars in 1994-1995 where they added the stepped bottom (which they still use now) that was said to eliminate 30% of lateral grip (due to downforce), the halfscale wings (in height) that started in 1995. Only in 2009 did the wings get back to ~1m in height but this time they were about half as narrow as back in the day. Then the grooved tires of 1998, also killed grip massively.
Then I'd say the removal of the winglets in 2009 and the engine formula.
It would be awesome to see a graph of lateral grip (possibly speed) around an unchanged, unaccelerating, corner throughout all the years (it would have to be a corner from either:
Montreal, Silverstone, (Monaco), Hungaroring, Spa, Monza, Suzuka or Interlagos.
THose are the oldest circuits still in use, there must be a corner that has remained (the least) unchanged throughout the decades in one of them.
We pity new F1 fans coming into the sport in 2012. They are forced to like F1 with these grotesque nose designs.