I was surprised I had not see this site before. (I found it on Jana's Genealogy blog).
Family History Technology Lab
It has some very interesting tools.
One in particular caught my interest Grandma's Pie.
This pie plots your ethnicity based on your findings in your tree (if it is on Family Search). It gives you your Ethinic breakdown percentages for each generations up to 8 generations.
I would love to hear from our DNA experts if we can do a comparision between this pie and our DNA ethinic break down. Can we potentially remove the known ancestors and guess at the missing ancestors? For example. I have a lot of known German ancestry and a high percentage of Unknown Irish Ancestry. Can I remove the known German ancestors and focus on the unknown Ancestors and have an estimated idea that they are likely Irish. If so, I can focus my research on Irish Ancestors?