text rotation and mathtext

Can text created with mathtext can be rotated? I am trying

    > to label a y axis like y = ylabel(r'rm\{Temperature\}     > \(^\\circ C\)') and y.set_rotation() does not respond to
    > 'horizontal' or 'vertical' settings.

Vertical rotation is not supported yet. I adjust the alignment args
so at least the horizontal ylabels are in the right place

  ylabel(r'\\Delta\_\{i\+1\}', fontsize='x-large',
         verticalalignment='center',
         horizontalalignment='right',
         rotation='horizontal'
         )

The good news is that Jim Benson just sent me a patch to support
vertical mathtext in *Agg, which will be included in the next release.

Cheers,
JDH