Ran out of rocket youtube videos to watch and now I'm watching all the wrecks and safety advice. I thought this might be interesting to some as this video teaches counter to what I've been taught.
I've had it pounded into my head to brake before you enter a turn while the bike is still upright, then roll on the throttle a bit as your leaning and going through. I was taught that touching the brakes while leaned over is a sure fire way end up on the ground. Apparently this is not the way to do it.
This video says to lightly touch the brake (no grabbing, just enough to light up the brake light) and this will shift the weight and preload the tire a bit increasing the traction footprint. However, you do need to have a practiced and gentle hand before attempting it. A lot of what they say makes sense to me. Even those these guys are a bit comical and act like their in an infomercial (plus I think the guy on the right sounds like joe dirt). Might be worth a look.