\begin{figure}[tb]
 \begin{center}
  \includegraphics[height=4cm]{ndp_table}\includegraphics[height=4cm]{ndp_table2}
 \end{center}
 \caption{NDP Table: Linux vs USAGI\label{ndp_table}}
\end{figure}

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Need the whole page?  Note the asterisk after 'figure'...

\begin{figure*}[t]
\begin{center}
\includegraphics[width=0.65\textwidth]{chaos} \ \\
(a) Chip \hspace{3cm} (b) CPU
\caption{A micrograph of an on-chip-multiprocessor M32R prototype chip}
\label{chaos}
\end{center}
\end{figure*}

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\begin{figure*}
\begin{center}
\begin{minipage}{16cm}
\begin{center}
\includegraphics[width=0.475\textwidth]{mappi}
\hspace{1cm}
\includegraphics[scale=0.7]{mappi_diagram}
\end{center}
\end{minipage}
\caption{Mappi: the M32R FPGA evaluation board; it has the M32R
softmacro on FPGA (CPU, MMU, Cache, SDI, SDRAMC, UART, Timer), FPGA
Xilinx XCV2000E $\times$2, SDRAM(64MB), FlashROM, 10BaseT Ethernet,
Serial 2ch, PC-card slot $\times$2, and Display I/F(VGA)} \label{mappi}
\end{center}
\end{figure*}