I was recently introduced to BatchGEO (batchgeo.com). It is a mapping service which will plot multiple locations on a map based on address information compiled on a spreadsheet. The home page allows you to paste records directly on the page or to download a spreadsheet template to import later. With your data loaded on the web page, you can click the Map Now button and all the locations will be plotted and displayed on a map. You can save the map and a link to the map can be shared with other folks. A bonus is when the map is emailed and opened on an Android mobile device, driving directions are available.