I have had a few, Met the instructor in daytona a few times. I attempt to practice the skills whenever i can. If i'm taking a little ride, and come across an empty parking lot, I like to go practice figure 8's and tight turns, using the "friction Zone"
I saw a video by Keith Cole, " the cornering bible" on this site, and have picked up some more tips.
You never stop learning, it can be done cheap and free, or you can spend some cash and have a trainer learn you up.
I for one, would like to do a "police" motor officers training type course. I'ts just hard to find the time and money.