Thankfully no, it's not something I've ever had to do, although I've been trained to do it.
Supplement from 08/28/2008 10:41pm:
the Heimlich Manoeuvre (after Henry Heimlich, who first described the procedure in a June 1974 informal article entitled "Pop Goes the Cafe Coronary," published in the journal Emergency Medicine). Edward A. Patrick, MD, PhD, an associate of Heimlich, has claimed to be the uncredited co-developer of the procedure, and has been quoted calling it the Patrick manoeuvre. Heimlich has objected to the name "abdominal thrusts" on the grounds that the vagueness of the term "abdomen" could cause the rescuer to exert force at the wrong site.
http://en.wikipedia.org/wiki/Choking copy