Something I've noticed...on super bikes, cockpits seem to be somewhat inline with the headtube/fork. When looking at the bike from the side, the basebar and cups generally seem to sit right on top of the head tube. But on a non super bike with a traditional stem (like what I have) the basebar and cups generally seem to be out in front of the head tube.

What's behind this? Am I mistaken and I just happen to see bikes where that is the case, or is there more there?