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method from rendering. I did have to comment these out to get my two
overlay groups to work.

So I found another post that says we should be using filter functions
to accomplish my goal of multiple groups of overlay layers.
http://www.geoext.org/pipermail/users/2009-October/000325.html

I'm not sure where to go from here - what is the right way to create
multiple overlay groups and how can select the layers within those
groups with radio buttons instead of checkboxes?

My geoext implementation is here:
http://maps.nijel.org/waterorg/map/

Thanks.