I just applied to a job on Careers, and while reviewing the PDF résumé that was sent to them, I noticed some bad rendering or perhaps kerning going on:
Stack Overflow Careers HTML site:
You can see the problem in between "CSS" and "as", and again between "CoffeeScript" and "and". It might have something to do with the bold/emphasis tags too.
I am running on OS X v10.8 (Mountain Lion) and am viewing in Preview.