This was an interesting read; I myself feel I lost a good job opportunity because it was for a tech support position and I mentioned that I wanted to move into network administration; at the time I thought this showed a drive to succeed. I don't completely agree with the document, though, in that I can't see why showing ambition can hurt (provided you do it subtely). I would think that any company that would not hire you because you want to improve yourself (and them by default) shows that they wouldn't promote you anyways and is therefore not the kind of business you want to work for in the first place.