Use the minipage environment. Here's some example syntax:
\begin{figure}[hbp]
\begin{minipage}[b]{0.5\linewidth}
% A minipage that covers half the page, width-wise
\centering \psfig{file=file1.eps,width=3in,height=3in}
\caption{First stupendous result}
\end{minipage}
\hspace{0.5cm} % To get a little bit of
space between the figures
\begin{minipage}[b]{0.5\linewidth}
\centering \psfig{file=file2.eps,width=3in,height=3in}
\caption{Second stupendous result}
\end{minipage}
\end{figure}