\begin{frame}{Who is Using it?}
  Mercurial is used by:
  \begin{itemize}
  \item Oracle for Java, OpenSolaris, NetBeans, OpenOffice, \dots
  \item Mozilla for Firefox, Thunderbird, \dots
  \item Google
  \item many more\dots
  \end{itemize}
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    \node[shift={(38mm, -28mm)}] at (O) {\includegraphics[width=2.2cm]{firefox}};
    \node[shift={(-36mm, -2mm)}] at (O) {\includegraphics[width=2.5cm]{openjdk}};
    \node[shift={(-34mm, -16mm)}] at (O) {\includegraphics[width=3cm]{netbeans}};
    \node[shift={(36mm, 18mm)}] at (O) {\includegraphics[width=3cm]{openoffice}};
    \node[shift={(14mm, -20mm)}] at (O) {\includegraphics[width=1.8cm]{opensolaris}};
    \node[shift={(-14mm, 12mm)}] at (O) {\includegraphics[width=1.2cm]{w3c}};
    \node[shift={(6mm, 14mm)}] at (O) {\includegraphics[width=1.6cm]{dovecot}};
    \node[shift={(-26mm, -32mm)}] at (O) {\includegraphics[width=1.4cm]{vim-logo}};
    \node[shift={(-8mm, -22mm)}] at (O) {\includegraphics[width=1.6cm]{go-gopher}};
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\end{frame}