• GIS for Oceans [Jan 2011, PDF, 7Mb]
• Essays on Geography and GIS, volume 3 [Feb 2011, PDF, 1.6Mb], volume 2 [July 2009, PDF, 2.1Mb] and volume 1 [Sep 2008, PDF, 5Mb]
• Geomedicine. Can geographic information make me healthy? [Nov 2010, PDF, 1.7Mb]
• Changing Geography by Design [Oct 2010, PDF, 2.5Mb]
• Climate Change is a geographic problem [June 2010, PDF, 2Mb]
• Managing GIS [Nov 2010, PDF, 3.9Mb]
• GIS in Africa [Mar 2009, PDF, 3.6Mb]

And a lot of other ESRI books.

The GIS books from ESRI by geometrus, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.