The whole article is worth a read, but here is my favorite section, given my recent crusade about putting speed lower in the order:
But the Pirates' unorthodox moves don't stop there. Batting leadoff is the un-leadoffish Akinori Iwamura. The second baseman doesn't fit the prototype for a leadoff man, considering that he has never stolen more than 12 bases in a season. The move is even more curious when you consider that McCutchen, Jones and Lastings Milledge all have stronger stolen base capabilities, yet are hitting further down in the order. But according to the statistics in The Book, the leadoff man's most important attributes are to be a very good hitter overall and to have the ability to get on base, which Iwamura is very adept at doing. In fact, the advantage of speed at the top of the order is actually somewhat mitigated by the fact that you don't want to risk getting thrown out stealing ahead of the best hitters in the lineup.