Thanks for that, Dan; it's a great site. I had been looking for some down-to-earth explanations of O lifts, and this is just what I wanted
It also has one of the best quotes I've read on warming up (DLs in this case):
One can not warm up properly by just lifting a barbell as high as one's crotch. The optimum body warm up will always take place with the most amount of barbell movement! Which is from the floor to arms length overhead.