[sabj]

Furthermore, the fact that a resume is written in LaTeX doesn't mean you publish it that way. If you have really great-looking PDFs that you send out, who's to care? When I send out my resume, I only send PDFs etc anyway, unless explicitly requested otherwise. Can't trust recipient clients. Not that you always can with PDF, either...

[burgerbrain]

I've had interviewers recognize my use of LaTeX on hardcopies of my resume by recognizing Computer Modern.

[beoba]

Another telltale sign are the default margins, though I spose someone would sooner change the margins than change the font.