\documentclass{beamer}
\usepackage{graphics}
\usepackage{epsfig}

\begin{document}

\maketitle

\begin{frame}{Title}
\begin{columns}
\begin{column}{0.5\columnwidth}
\begin{itemize}
\item <1-> a
\item <2-> b
\end{itemize}
\end{column}

\begin{column}{0.5\columnwidth}
\begin{itemize}
\item<1-> \includegraphics[width=0.8\textwidth]{figures/f0.eps}
\item<2-> \includegraphics[width=0.8\textwidth]{figures/f1.eps}
\end{itemize}
\end{column}
\end{columns}
\end{frame}

\end{document}