MapInSeconds.com by Darkhorse Analytics
MapInSeconds lets people create choropleth maps just by copying and pasting data from a spreadsheet/Excel.
A major goal of this is to make map-making straightforward and accessible. The maps can be saved as an image or as part of a Powerpoint slide, and a number of good map design practices (like colorbrewer colours, classing, "nice" readable legend values) are built in.
Also, the default "AutoMagic" option lets users copy and paste data in and the best map will be automatically selected.