How Maps Change Things: A Conversation About the Maps We Choose and the World We Want by Ward Kaiser is being released on March 5th, the 500th birthday of famous map-maker Gerhard Kremer, aka Mercator. The book is available as a free download
for the full month of March, 2012 as a PDF, [and mobi and epub] for iPhones and Kindle. The book examines maps as change agents, reflecting intentions and setting agendas, revealing who has power and resources, and who has not. It helps to explain the messages maps send.
The gift is from New Internationalist Magazine and ODTmaps.com and several academis and geospatial folks like Joe Kerski of Esri are quoted noting the book's value.