Spreadsheet Mapper 2.0

A Google tutorial shows you how to enter data in an on-line spreadsheet to generate a set of markers in Google Earth and Maps and Google Maps API. Google Docs' web-based, collaborative editing allows your team members to simultaneously enter data and instantly publish updates.

"Using this tool you could: showcase your organization's projects, program sites or partners; map your offices, volunteers, or resources; or visualize your data on local, regional or global scales."



Time to create Lines and Polygons...
Lines

Excel to KML (now with Line and Arrows from GPS track logs) http://www.earthpoint.us/ExcelToKml.aspx

Polygons

http://code.google.com/articles/support/ezdigitizer.htm
(copy and paste the code into excel or notepad and save as kml)

Official Link:

http://earth.google.com/outreach/tutorial_mapper.html

source: http://freegeographytools.com/