ggplot2 and lattice

I am in the process of learning lattice graphics and have looked at
ggplot2 a little.  I would like to know if there is a "tutorial" that
shows how to convert lattice code into ggplot code and vise versa.  I
am finally discovering the power of these two packages and would like
suggestions to lessen my learning curve.  I could not find a straight
foward answer on the internet (I may have not looked far enough) to
what a parralelle plot is used for.
thanks

Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods. We are mammals, and have not exhausted the
annoying little problems of being mammals.

	-K. Mullis