Ja, auch Briefe kann man mit LaTeX schreiben. Verwendet werden dazu das Paket dinbrief und der Aufruf pdflatex Brief.tex. Das eingefügte Facsimile facsimile.jpg muss im selben Verzeichnis liegen.

\documentclass[10pt]{dinbrief}
\usepackage{german}
\usepackage[utf8]{inputenc}
\usepackage{graphics}
\address{Dr. Heinz Breinlinger\\
Ludwig-Thoma-Str. 9\\
85649 Brunnthal,\\
Germany}
\backaddress{Dr. Heinz Breinlinger,
Ludwig-Thoma-Str. 9,
85649 Brunnthal,
Germany}
\signature{Heinz}
\place{Brunnthal}
\pagestyle{contheadings}
\begin{document}
%%-----------------------------------------------------------------------------------------
%% Fu"szeile
%%-----------------------------------------------------------------------------------------
\bottomtext{
\footnotesize{
\begin{tabular}{ll}
mail: & heinz.breinlinger@web.de\\
cell: & +49 0123456789\\
phone: & +49 0123 456789\\
fax: & +49 0123 987564
\end{tabular}
}
}
%%-----------------------------------------------------------------------------------------
%% Adre"se
%%-----------------------------------------------------------------------------------------
\begin{letter}{Michelle Obama\\
The Whitehouse\\
1600 Pennsylvania Avenue, NW\\
Washington, DC 20500
}
%%-----------------------------------------------------------------------------------------
%% Bezug
%%-----------------------------------------------------------------------------------------
%%\phone{+498104}{8899576}
%%\writer{Dr. Breinlinger}
%%\sign{Dr. Breinlinger, 01.01.2012}
%%\yourmail{Hugendubel,01.01.2012}
\subject{your husband's accessories}
%%\concern{your husband}
%%-----------------------------------------------------------------------------------------
%% Text
%%-----------------------------------------------------------------------------------------
\opening{Dear Michelle,}
your husband displayed such a unique tie on his recent television appearance. Dare I ask where you had it purchased or taylored ?\\\\
\dots
%%-----------------------------------------------------------------------------------------
%%Cave: F"ur DVI .ps, f"ur PDFLATEX .jpg !
%%Cave: Der Dateipfad darf keine Leerzeichen enthalten !
%%-----------------------------------------------------------------------------------------
\closing[\includegraphics{facsimile.jpg}]{Kind regards an the best of luck for your campaign trail}
%%-----------------------------------------------------------------------------------------
%% Anlagen
%%-----------------------------------------------------------------------------------------
\encl{1 stamp for reply}
\end{letter}
\end{document}