Laputan Logic links to the Surname Profiler at UCL. He also has interesting comments on tracing surnames. If the proposed connection between surnames and Y-chromosomes holds then you can bask in the genetic link to your forefathers. If you lack a Y-chromosome then you’ll just have to comfort yourself with the knowledge you can think with your brain instead.
If you’re one of these people who changed their surname a while ago then a map like this might not tell you so much about your ancestors. On a totally unconnected note I’ve found that if you’re looking for Mackensie, you need to spell it with a ‘z’.Google+