For anyone who doubts the power of the flopped set, check out these stats I just noticed today in Poker Tracker. These stats are for 205 tournaments, of various types.
Final Hand : Tournament Amount Won
High Card : -88,811
One Pair : 1,046
Two Pair : 92,015
Three of a Kind : 110,166
Straight : 11,881
Flush : 56,820
Full House : 22,624
Four of a Kind : 7,351
Despite hitting 2-pair more than 5 times as often as sets, I've still earned more tournament chips with the sets. Boats and quads are great, but nothing gets paid like a set.