Hi Tom,

Thanks for the pointer, how about this revised version of the patch.  It
takes the following inputs

#+begin_src org
  #+CAPTION: A wide table with tabulary
  #+LABEL: tbl:wide
  #+ATTR_LaTeX: table* tabulary[\textwidth] align=l|lp{3cm}r|l
  | 1 | 2 | 3 |
  | 4 | 5 | 6 |

  #+CAPTION: A normal table with tabularx
  #+LABEL: tbl:wide
  #+ATTR_LaTeX: table tabularx[\textwidth] align=l|lp{3cm}r|l
  | 1 | 2 | 3 |
  | 4 | 5 | 6 |
#+end_src

and yields the following output

#+begin_src latex
  \begin{table*}[htb]
  \caption{A wide table with tabulary} \label{tbl:wide}
  \begin{center}
  \begin{tabulary}{\textwidth}{l|lp{3cm}r|l}
   1  &  2  &  3  \\
   4  &  5  &  6  \\
  \end{tabulary}
  \end{center}
  \end{table*}


  \begin{table}[htb]
  \caption{A normal table with tabularx} \label{tbl:wide}
  \begin{center}
  \begin{tabularx}{\textwidth}{l|lp{3cm}r|l}
   1  &  2  &  3  \\
   4  &  5  &  6  \\
  \end{tabularx}
  \end{center}
  \end{table}
#+end_src

I'm not sure about the square bracket syntax, maybe curly would be
preferable.  Definitely open to suggestions.

Should this be applied?  Are there any obvious areas for improvement?

Thanks -- Eric