Circuit Driver has the best instructional content I know. Register on the site and go for Track Technique.

I believe the content is written by Mark Hales who also does track instruction in the UK.

Don’t ask where you can log on again though 😉 I have only needed to log-in again once and I did it through “My Profile”

Please, lazyweb, point me to a similar gravel technique site. Any other slippery surface will be as good.