Is there some reason that recruiters and headhunters want resumes in Word format, beyond the fact that that's just all they're familiar with?

Years ago I rewrote my resume in TeX so that I could manage it easily and easily produce a PDF of it. And every time I want to send it out, it's all "do you have this in Word format?"

It's even more infuriating when you're applying for a Unix Admin position. Really? You're really requiring me to use a computer program that doesn't exist for the systems I'm applying to work on, and which produces inferior output to what I've already given you? It seems to me that this is like applying for a job as a chef de cuisine and one of the hurdles being to make a McDonald's hamburger.