Relevant observation: "hammer and nail" effect seems to be the same thing as pg's Blub paradox[0] or the phenomenon that when you start carrying Duct Tape with you, you'll suddenly find some use for it every other day.

Because of that I think we should learn not to dismiss things just because we can't imagine what we can do with them. The imagination will most likely come with use of the tool.

[0] - http://en.wikipedia.org/wiki/Paul_Graham_(computer_programme...