Just for fun, here is where my current best laps compare to NASA TT track records:
Blackhawk Farms
TTA Don Guest Corvette 1:34.34
TTB Mike Atlas M3 1:24.53
TTC John Slinkard S2000 1:21.05
TTD Allen Skillicorn S2000 1:23.34
Me: 1:23.250
With the TTC record being quicker than TTA or TTB, I take those times with a grain of salt (assuming neither TTA or TTB car is built to the rules or driven to its potential). I only have two days experience on Blackhawk, could find improvement with more seat-time. NASA did not run blackhawk in 2007 so all these times are from 2006.
Putnam Park
TTA Jesse White Corvette 1:17.11
TTB John Slinkard S2000 1:17.77
TTC John Slinkard S2000 1:20.69
TTC Erik Gerrits Clownshoe 1:22.873
TTD Kyle Burkhardt M3 1:23.42
Me: 1:25.075
My TBL: 1:24.244
I think my car has potential to do a lot better at Putnam. With a little more practice there and ideal conditions, I would hope for a 1:21-1:22 (still short of TTC... I hate losing to S2000's, grrrr!!)
Autobahn South
TTA Jesse White Corvette 1:34.54
TTB John Slinkard S2000 1:35.71
TTC John Slinkard S2000 1:38.70
TTC Erik Gerrits Clownshoe 1:41.847
TTD Kyle Burkhardt M3 1:40.06
Me: 1:41.300
I honestly gave it everything I had to get that 1:41.xx. Since then I have dropped about 150 lbs from the car and running a shorter diff.. could be some gains there but not holding my breath for much. 1:39.xx would take some work and that is hauling pretty good around that track.
Autobahn Full
TTA Jesse White Corvette 2:43.42
TTB John Slinkard S2000 2:45.88
TTD Bill Biagi Mustang 2:55.03
Me: 2.51.748
This was with my new diff and lighter weight. I hope to crack into the high 2:4x's next year but that's going to take everything I got.

I consider autobahn my current "home" track as I get to drive there quite a bit. (cant use the excuse of needing more practice there, lol!)
Road America
TTA Jesse White Corvette 2:30.99
TTB Robert Dudek Corvette 2:40.70
TTC John Slinkard S2000 2:39.68
TTC Erik Gerrits Clownshoe 2:40.606
TTD Bill Biagi Mustang 2:44.51
Me: 2:42.689
Edit: throwing in times for Erik Gerrits