For those interested, I've attached a trip report documenting my experience in the BMW Performance Driving School Advanced M School at Virginia International Raceway, July 20-21, 2009.
This was a tremendously rewarding course, and highly recommended - lots of good info here for anybody considering taking the course, and anybody curious about how these cars perform when pushed very, very hard. I'm no racer, but tried to capture my thoughts regarding the school, the track and the cars from the perspective of an amateur enthusiast, presented for what it's worth.
This forum has been of great value to me in enjoying my car, and I hope this is of equal use to others using this board.
Cars flailed without mercy included the E90 M3, E60 M5, and E63 M6.