Great article!
I use my rear brake when mountain biking all the time to tighten up a corner. That's fun as hell!
I don't touch it on the track though. I started playing around with trailbraking through a corner or two at Jennings using the front brake, but I'm nowhere near comfortable with it. I'm still at the point of preferring to be completely off the brakes before tipping in.
I want to go to the California Superbike School!