A couple of years ago when I first started genealogy research I seem to remember coming across a site that had a map of the US that would show in various shades of blue (I think) the concentration of a particular surname by state/region (the particular surname I was seeking at the time was definitely concentrated in the northeast, appeared to a lesser degree on the east coast heading south, and was virtually non-existent in the middle states and on the west coast). I'm trying to find that site again... Does anyone know what site I'm talking about? (Or am I going crazy?)