I am also going to give my endorsement of the Trillium Club. With the economy being a bit shaky lately, a lot of these clubs are in tough financial shape. If you have ever thought of hitting the track to see what these cars can actually do, now is the time.
I should say, I have no financial stake in the club (in fact, it's a non-profit), but it would be a shame to lose this organization due to lack of participation.
The thing that keeps a lot of people from going to the track is the fear of damaging their cars, and that is all the more reason that we need clubs that are run safely like this one is.
These driving schools are also an insane amount of fun. I have taken my 3.0 for the past 3 years, and i'll be there this year with my M. There is truly no point in having a car like this if you have never had it on a track.
Here's the site:
http://trillium-bmwclub.ca/