This is obliquely related to this query, except that I would like to have a tabularx environment where the entire first column is in italics (or some other standard formatting). The following obviously does not work:
\documentclass{article}
\usepackage{array, tabularx}
\begin{document}
\begin{table}[htbp]
\begin{tabularx}{\linewidth}{>{\em}X{}<XX}
a & a & a \\
b & b & b
\end{tabularx}
\end{table}
\end{document}
I do actually need tabularx since I expect the last column to contain quite long sentences.

{}<which should be omitted or should be<{}(Using\itshapeis most likely more semantically correct than using\embut it would have worked) – David Carlisle Oct 15 '12 at 16:28tabularx, not noticing that I was making a typo. – tchakravarty Oct 16 '12 at 01:00