% Make tabular environments appear in a small typeface.
% TODO: What to do with tabular* environment? Use \@ifstar?
\let\orig@tabular=\tabular
\let\endorig@tabular=\endtabular
\renewenvironment{tabular}[2][]{%
  \begin{small}\orig@tabular[#1]{#2}%
}{%
  \endorig@tabular\end{small}%
}