http://tex.stackexchange.com/a/51181/3323

\documentclass{scrartcl}
\usepackage{beamerarticle}
%\documentclass{beamer}

\usepackage[utf8]{inputenc}

\setbeamertemplate{footline}[frame number]

\mode<article>{
    \renewcommand{\frametitle}[1]{\subsubsection*{#1 [Slide \insertframenumber]}}
    \def\insertsection{}
}

\mode<article>
\usepackage{xparse}
\makeatletter
\expandafter\let\expandafter\originalsection\expandafter=\csname @orig\string\section\endcsname
\RenewDocumentCommand{\section}{ D<>{} s o m }
{
  \alt<#1>
  {
    \IfBooleanTF {#2}
    {
      \originalsection*{#4}
      %\beamer@atbeginsections % breaks because section* is also used e.g. in the TOC
    }
    {
      \IfNoValueTF {#3} { \originalsection{#4} } { \originalsection[#3]{#4} }
      \beamer@atbeginsection
    }
  }
  {
    \beamer@secgobble
  }
}
\makeatother
\mode<all>

\AtBeginSection[]
{
    \begin{frame}<article:0>
        \begin{center}
            \structure{\Huge \insertsection}
        \end{center}
    \end{frame}
}

\begin{document}

    \begin{frame}
        \tableofcontents
    \end{frame}

    \section{Section 1}

        \begin{frame}
            \frametitle{Frame A}

            Frame A
        \end{frame}

    \section{Section 2}
    %\section*{Section Star}

        \begin{frame}
            \frametitle{Frame B}

            Frame B
        \end{frame}

\end{document}