I thought it might be useful to start a thread with information, links, videos related to The Ring since it's on every true Porsche enthusiast's bucket list.
This is an excellent turn-by-turn guide to driving the ring with detailed tips, pictures, and instruction (apologies about the cover photo):
http://guildhouse.net/BMW330Ci/nordschleife.pdf
Including Sascha Maassen's lap of The Ring in a Cup car instructional video for obvious reasons.
The same lap with mainly interior view:
This Cup ride-along from the 24h race provides a good view of handwork. Also has a unique paddle-shift operated sequential.