Here is a good "DOs and DON'Ts site for driving on the ring with video examples.

bridgetogantry.com - BTG Safety Guide

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06 Cayman GT-urbo

WOW,.. Some great videos!

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Seat of the pants dyno

That's a great find!

The site gave some guidelines but not too detailed descriptions about the track itself.

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Future Cayman S: 56 - Cobalt blue, RA - Cocoa leather, M6C - floor mats, 639 - Sport Chrono, 460 - sport leather steering wheel, 403 - 19" Carrera S wheels, P12 - dimming mirrors and rain sensor, P74 - bi-xenons, 342 - heated seats.

Now, I don't know anything about this guy or his site, but he certainly seems to spend a lot of time at and around "the ring."

I find this entry a little interesting...
Cayman

This one's for the conspiracy theorists. I don't know about a turbo (i would guess it's just the Porsche sport exhaust he's hearing)... but what in the world is a "facelifted" disguised cayman doing on the ring in a factory car with what looks 997 GT3 seats and a harness bar? Does anybody know if this is simply SOP for Porsche factory testing on the ring (the seats and bar)? Is there a reason to take a car with only cosmetic changes back out for performance tests? Of course, it could be just to create buzz for the model update. I kind of suspect this is the case with most "spy shots" that are taken on public roads. And there aren't many public roads with a higher profile than this one...