Krugman has two good posts (here and here) on what economists call "skill biased technological change" - technological change that influences the skill-composition of labor demand. Traditionally, the literature has covered change biased in favor of skilled workers (hence the name).
In the second post, he citest the fairly well known Autor, Levy, and Murnane (2003) article. Levy and Murnane also have a pretty good book on the subject that I read a few years back.
Krugman cites a case of lawyer-displacing technology. I also read an interesting article this weekend about psychiatrist-displacing technology in The Economist.
DeLong has thoughts here, Ezra Klein has thoughts here.
I've always found this to be a fascinating and important area of work - I don't have time to go through each piece now and comment in detail, but I wanted to provide the links. One of the things that isn't mentioned here is a discussion of mid-level skills, and their role in driving the college wage premium. This is a strain of the discussion that I get a lot at the Urban Institute from guys like Bob Lerman (of American University, btw), Harry Holzer, and Hal Salzman (formerly of the Institute - my co-author on my NBER engineering labor supply chapter). Anyway - lots to talk about. It's no surprise they don't get into that here.