Hello MapAList Faithful - it's been a while!
Our most recent release includes a new map type called "Concentration/Heat Map."
This new map type is great for large data sets with many addresses. It essentially creates a map in which the density of color (red) displayed is higher in areas with more addresses.
The creation process is super simple...just choose "Concentration/Heat Map" in step 4 of the mapping process and you're good to go. Check it out:
The rest should be very straightforward with a result that looks like the map you see below (note that I have about 4000 points in my Google Spreadsheet):
Unfortunately, right now Concentration/Heat Maps don't allow you to see actual points on the map or click on them and get a pop up bubble, but if you have a big data set this might be just what you're looking for.
If you have a large data set, give it a go and see what you think...