Hello,

On the wiki (http://contextgarden.net/Vertically_centred) a while ago 
someone asked how to do the following in ConTeXt:

%%%%%%

\documentclass{article}
\begin{document}
a box with a table:
\fbox{\begin{tabular}[c]{l}1\\2\\3\end{tabular}}\par

a midaligned parbox: \parbox[c]{1em}{1 2 3}
\end{document}

%%%%%%

I don't know if this would be the proper solution, but for the second 
case (\parbox[c]{1em}{...} which should make a paragraph 1 em wide and 
center the paragraph box vertically) I tried the following:

%%%%%%

\setupTABLE[frame=on] % only for debugging reasons
\setupTABLE[c][1,2][align=lohi] % to center vertically (any better way?)
\bTABLE
\bTR\bTD
	a midaligned parbox:
\eTD\bTD[offset=0pt,width=1em] % 1em wide paragraph
	1 2 3
\eTD\eTR
\eTABLE

%%%%%%

My ConTeXt version is 2005.06.27.
See the vcenter-context-old.png for the result.

The strange thing is that the number 2 is still in the first line, 
although it is too wide.

Even more strange, I tried the same on live.contextgarden.net. See 
vcenter-context-new.png for the result.

vcenter-latex.tex is what the result should be.

-------------------------------------------------------------------

This also results in a mess on the live.contextgarden.net:

\bTABLE
\bTR\bTD
     {\bTABLE
        \bTR\bTD whatever \eTD\eTR
     \eTABLE}
\eTD\eTR
\eTABLE

Mojca