Tom at Redleg Nation breaks down the rotation slots for both the American and National League in 2006. What's interesting to me is that the NL front line starters have ERA better than their AL counterparts, but the back of the rotation is better in the junior circuit (That result does not hold for XERA.) The other thing is that #5 starters are so bad, why don't more teams do something to avoid using them? I'm not talking about going to a four man rotation, but at least skipping the fifth starter if the team gets a day off.