Rick, ZL2HAM, created the map below of the log submissions for CQ WW Phone 2011.
The smallest dots represent 1 or 2 stations at the same location; the next size up is 3 to 9 stations, then 10 to 99, then 100 or more (grouping tends to happen when the only lat/lon data available is at a country or region level). Click on any image to view full size.
Europe
USA