smallcompany - 7:20 am on Nov 11, 2010 (gmt 0)
Apparently you can copy a current adgroup
I did that once long time ago (within the interface) when creating a new ad group.
I was surprised to see that any change to one would cause the change to another ad group or something like that (hard to recall the exact thing now).
It turned that with using existing ad group as a template for a new one caused new one to carry the same ID.