My resume (typeset with XeTeX) spans an entire US letter page, with small margins on either side. It's generally accepted that this is bad for readability, and I want people to be able to read my resume. Therefore, I was thinking that I could increase the margins and make the resume two pages instead, improving readability. However, I believe that these narrow margins and long lines are pretty standard, especially given the large number of people that typeset their resumes with a word processor, which have poor defaults for readability.
I am a software engineer with a strong interest in design, and I work on UIs a lot, so readability is something that I care about and is relevant to my job. In addition to the subtle effects of improved readability, which may go unnoticed (good design choices often do), a prospective interviewer might think "oh, this person gets typography", or they might think something like "this person is trying to pad the length of their resume" or "why is this person's resume layed out so differently?". Which is more likely?