@pastanaga - Actually I was reading an article the other day about the massive disparity that still exists between people who understand computers intuitively (usually people who have grown up with them) and people who don't. The journalist was talking about how in a previous job she would often be given expensive training courses in order to teach her skills that she already knew just from blogging or hanging out on Facebook with her friends.
I think at the moment we're at the point where the people doing the hiring might still not understand computers that well themselves, and the people being hired understand them so well they don't know how to market themselves because they take their skills for granted.
This is why people who know computers should take a computer skills assessment test in order to get down on paper proof of what they can do. They might be surprised at how valuable the skills can be.