One of the features Apple took away in Xcode 4 was splits.
predicted headline feature of Xcode 5: splits
But it turns out you can clumsily emulate them with Xcode 4’s Assistant Editors:
@rentzsch like text splits? already there. View > Assistant Editor > Add Assistant Editor (and various shortcuts)
@kongtomorrow that only works when you have an assistant editor showing. Very rarely that I do. Need it for standard editor