Oh, that's right, I have a blog. Had almost forgotten about it.
I just faced the problem of setting multiple authors in a LaTeX document together with their affiliations. On top of that, one of the authors had multiple affiliations. Google returned this excellent answer on TeX StackExchange. In short; use the authblk package:
\documentclass[a4paper,11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{authblk}
\title{More than one Author with different Affiliations}
\author[1]{Author A\thanks{A.A@university.edu}}
\author[2]{Author D\thanks{D.D@university.edu}}
\author[1,2]{Author E\thanks{E.E@university.edu}}
\affil[1]{Department of Computer Science, \LaTeX\ University}
\affil[2]{Department of Mechanical Engineering, \LaTeX\ University}
\begin{document}
\maketitle
\end{document}\thanks is useful to add footnotes to the authors, in this case their email addresses.