Add affiliations to the authors' name in the article class

Using authblk maybe it's better to do something like:

\documentclass{article}
\usepackage{authblk}
\title{This is some thing}
\author[1]{Don Joe}
\author[2]{Smith K.}
\author[1]{Wanderer}
\author[1]{Static}
\affil[1]{TeX.SX}
\affil[2]{Both on a bus}
\date{}                     %% if you don't need date to appear
\setcounter{Maxaffil}{0}
\renewcommand\Affilfont{\itshape\small}
\begin{document}
  \maketitle
\end{document}

This way, you can mix affiliations.

When I've needed to use \maketitle, a trick I've used is to abuse \date{}:

\documentclass{article}
\title{My Title}
\author{Author One$^1$ \and Author Two$^2$}
\date{%
    $^1$Organization 1\\%
    $^2$Organization 2\\[2ex]%
    \today
}

\begin{document}
\maketitle
\end{document}

I always use a trick I learned from Anthony Liekens, which is used for showing multiple affiliations per author. Omitting the date is as easy as using \date{}.

\documentclass{article}
\usepackage{hyperref}
\newcommand{\footremember}[2]{%
    \footnote{#2}
    \newcounter{#1}
    \setcounter{#1}{\value{footnote}}%
}
\newcommand{\footrecall}[1]{%
    \footnotemark[\value{#1}]%
} 
\title{How to bowl properly}
\author{%
  The Dude\footremember{alley}{Holly Star Lanes Bowling Alley}%
  \and Walter Sobchak\footremember{trailer}{Probably in a trailer park}%
  \and Jesus Quintana\footrecall{alley} \footnote{Mexico?}%
  \and Uli Kunkel\footrecall{trailer} \footnote{Germany?}%
  }
\date{}
\begin{document}
\maketitle
The whole example is taken from \href{http://anthony.liekens.net/index.php/LaTeX/MultipleFootnoteReferences}{Anthony Liekens}\ldots
\end{document}