For Your Geographers/Scientists/Economists: Free Maps Of Renewable Resources
From the download page:
Maps provided as PDFs and JPEGs and there are six maps available to download.
By downloading a free resource map, you acknowledge that:
3TIER retains all rights, title, and interest in the information provided by the maps and the map images, including copyright, and all other intellectual property rights;
3TIER reserves the right to revoke your license at any time;
The images may not be visually altered in any way, either to the map image, or to eliminate or obscure the 3TIER logo;
The copyright notice (e.g. Copyright (c) 2010 3TIER, Inc.) must also be displayed in close proximity to each map image, but it may be included in a caption if the size of the map image makes the included copyright notice unreadable;
You may not resell the images or otherwise use them for commercial gain.
Example: Q4, 2009 Wind Speed Variance from Average:
Link and download page: Download Free 3TIER Resource Maps