I weigh more than yamahamaxdrpms and I did wheelies using this method.
Don't let off the throttle for more than a fraction of a second.
Go from light throttle(to maintain speed) to fully closed, to fully open as fast as possible.
This does a couple things:
Introduces a "shock load" to the driveline
Uses the rebound of the front forks
Both of which aid in doing a wheelie
It's really smooth when it comes up, but it can be scary if you're not ready for it, and it takes some getting used to.
Well, I never really had a desire to do a wheelie on my FZ6 (ok, I'm lying

) but after seeing this thread and SovietRobots advice, I got a little curious.
After dropping my girls at school this morning, I went home and got my bike for the ride to work, as I left my driveway and headed down the street, the temptation over came me (quiet street, no traffic).
I did exactly as SovietRobot and slide_show suggested, from a roll (about 35 mph), in 1st gear at about 6500-7000 rpm, I let off the throttle, then goosed it about 1/2 throttle, the front end came up slick as snot, I let off, the front end dropped (no wobble), and my boys promptly kissed the tank, Ouch! :banghead:
As slide_show suggests, I will definitely find a safe, quiet place to practice this technique. I will also bring my wife along to dial 911, just in case
All in all, it worked fine, and it is at a slow speed. I kicked a little rep to both of you as it worked just like you said.