I am drawing this from the semiconductor, telecommunications, automotive, healthcare technology, and travel domains. It doesn't really seem that relevant though as software developers are not tied to domains like say hardware engineers, or I guess non-programming domain specialists. Although now that I think about it, software developers do tend to pigeon-hole themselves a bit. I have heard of people calling themselves ".NET developers in the real estate branch", which I suppose is a psychological blocker to jumping to a better-paying job.