Mapspread is a Google Maps creation service that allows the user to create maps from spreadsheets,, KML, ESRI Shapefiles or MapInfo TAB files. The creation of maps with mapspread is very easy and the site has a very intuitive user interface.
The video below shows a map being created using mapspread:
If you want to see a map created using mapspread, Pamela Fox has created a map from the Google MyMap being run by volunteers showing the effects of Typhoon Ondoy, in the Philippines. This Ondoy Map has exactly the same data as the volunteer map but uses mapspread's clustering solution to present a tidier looking map.