Here are two more track day links:
http://www.mvptracktime.com/id25.html
2008 dates are posted.
http://roadamerica.fbody.us/
Usually RA dates in April and October.
For novices, I recommend NASA's HPDE program; class room instruction and instructors in the car with you. Cobra roll bars were allowed in 2007.
http://www.nasaproracing.com/hpde/index.html
RA, Autobahn, Gingerman, Putnam events planned for 2008.
The NASA Factory Five series is a race group; roll bars and competition license required.
Some of the clubs enforce a 1 or 2 inch "broom stick" rule. This a broom stick laying on the rollbar and the windshield; you must have 1 or 2 inches clearance between the stick and your helmet. Most clubs have the rule but some do not enforce it. Check before you sign up.
Email me if you want more info.
Jim