The Psychology of Everday Keyboards (Score 1)

If I recall correctly (I'm at work, so I can't check), "The Psychology of Everyday Things" ("The Design of Everyday Things" in paperback) by Donald Norman has a detailed discussion on keyboard layouts. He cites studies showing that, for beginners, alphabetic keyboards are no quicker than QWERTY, and for users with experience of QWERTY they're substantially slower.