pxpgfmark.sty

% pxpgfmark.sty
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{pxpgfmark}[2013/02/18 v0.1]
\@ifpackageloaded{pgfcore}{}{%else
  \PackageError{pxpgfmark}{Package 'pgfcore' must be loaded}\@ehc}
\def\pxqmk@tempa{pgfsys-dvipdfmx.def}
\ifx\pgfsysdriver\pxqmk@tempa
  \@tempswatrue
  \ifx\pdfsavepos\@undefined \@tempswafalse \fi
  \ifx\pdflastxpos\@undefined \@tempswafalse \fi
  \ifx\pdflastypos\@undefined \@tempswafalse \fi
  \ifx\pgf@sys@pdf@dvi@tracker\@undefined \@tempswafalse \fi
  \if@tempswa
    \pgf@sys@pdf@dvi@tracker
    \PackageInfo{pxpgfmark}{Position marking enabled}
  \fi
\fi
%% EOF

test-dan.tex

% cf. http://tex.stackexchange.com/questions/60812/beamer-tikz-generating-two-slides
\documentclass{beamer}
\usepackage{tikz}
\usepackage{pxpgfmark} % load this *after* tikz

\begin{document}
\begin{frame}
\frametitle{Power Utility Portfolio Choice}

\begin{itemize}
    \item Portfolio Return
        \tikz[remember picture, overlay, baseline=-.5ex]\node (n1) {};
\end{itemize}

\begin{equation*}
\begin{aligned}
& \underset{\boldsymbol w_t}{\text{maximise}}
& & \tikz[baseline,remember picture]{
        \node[fill=blue!20,anchor=base] (t1)
            {$\boldsymbol w_t \cdot \bar{\boldsymbol r}_t $};
    } + \frac{1 - \gamma}{2} 
    \tikz[baseline,remember picture]{
            \node[fill=red!20,anchor=base] (t2)
            {$ \boldsymbol w_t \cdot (\Sigma_t\boldsymbol w_t) $};
    } \\
& \text{subject to}
& & \boldsymbol w_t \cdot \boldsymbol \iota = 1\\
&&& \boldsymbol w_t \ge 0
\end{aligned}
\end{equation*}

\begin{itemize}
    \item Portfolio Variance
        \tikz[remember picture,overlay, baseline=-.5ex]\node (n2) {};
\end{itemize}

\begin{tikzpicture}[remember picture,overlay]
        \path[-stealth] (n1) edge [bend left] (t1);
        \path[-stealth] (n2) edge [out=0, in=-90] (t2);
\end{tikzpicture}

\end{frame}

\end{document}