LaTeX, for those who haven’t heard of, and fallen in love with, it, is a document formatting engine. It’s similar to HTML in how you’re encouraged to separate the content from the presentation. Rather than using a WYSIWYG editor like Microsoft Word, you use a plain-text editor to create .TEX files, then run them through a program that converts them into, for instance, a PDF.
LaTeX is often used for publication in many scientific fields, but I also use it for my personal resumé. Why? Because it’s so great at making documents look good. I use a slightly modified version of Michael DeCorte’s res.cls for the presentation, and, if I do say so myself, I think my resumé looks quite good for how little time I put into it.