Do this at least once a month, or more if I am anticipating riding two up or long trips. Usually in an empty lot nearby on Sundays (less cars and pedestrian traffic).
I try to head up to the empty school parking lot for 10 or 15 minutes every month or so. Probably should do it more often but I don't. I start by practicing straight ahead emergency stops at slowly increasing speeds up to about 30MPH or so - pretty much all I can get up to in the lot where I practice. Then I work on "ride like a pro" stuff - minimum radius left and right hand turns and figure eights.
It's amazing but I always feel a little more confident and in control of my bike after one of these sessions, even if it's only five minutes.
I don't want to hijack the thread/poll but I'd love to know how many folks practice this same type of stuff with a passenger along. I keep meaning to bribe my wife into riding up to the school with me so I can get better at riding with her on the back.