I try to look at things from the point of view of the user because without them, you're wasting your time.
Induction loop system
Here's some current work for an electronics company. I went from knowing nothing about the topic to designing a user interface in a few meetings and mocked up the design in Fireworks in a couple of hours. Then we tweaked (electronics guys don't like colour) and arrived at a final design.
Of course this process goes into each of the finished pieces on this site. It's just so much part of the process that I don't even think it's a skill. But it is I guess.