FYI: While not creating all the great statistic which Jadra's program provides, one can use the "Ancestor Graph" tool, selecting the "Grouping" option to show the 'color-coded' common ancestors for a particular person.
See the "History Link" project for more detials
http://www.geni.com/projects/HistoryLink/14021
and try the Ancestor Graph tool (based on Jadra's work!) here:
http://historylink.herokuapp.com/graph
... note you can change the 'focus person' from yourself to any other profile which you can view (public profile, or one in your family group).