Actually Allen Iverson is shorter than his listed 6'0". He's probably closer to 5'10". Iverson is a monster dunk artist. If you ever saw him play at Georgetown, he was just dunk happy back then. But after his first year in the league, he's pretty much resorted to laying up the ball to conserve energy.
Earl Manigault (a basketball legend in the 1960's that never made it to the NBA due to drug problems) is rumored to have a 52-inch vertical. http://members.spree.com/thegoat/earlmanigault/earlmanigault.html
