A couple of us have been trying to make a more objective (note that does not mean more accurate!) ranking of CS research departments. We're using the google scholar data combined with the h-index. Still lots of mistakes I am sure. Interesting that Greenberg and Hanrahan are in a dead heat for the highest rating in graphics. Not worth drawing too much conclusion from, but the data is interesting. I'd like to add more universities and research groups, so feel free to send me updates and suggestions.
The data is here