So far following this thread has been most illuminating. Using the various methods shown here, I've improved the leaf shader for my Dryad character:

The first is without translucency, using the wax like shader described in this thread

and the second is a back lit translucent shader

Still trying to work out how to dampen the translucency a bit so its not quite so strong.

...Insert some witty or thought provoking comment here...