Sample FEMA digital FIRM Maps
You can download sample digital FIRM maps here. There is a charge to aquire the full dataset. FIRM is a flood insurance rate map.
Free Traffic Volume GIS Data
Below are links to free, downloadable and gis-ready traffic volume data:
North Carolina (NCDOT) Traffic Volume Data
GA STARS (Georgia State Traffic and Report Statistics)
Florida DOT traffic volume data
Illinois Toll Road Traffic Volume Data
Prism Climate Data
Monthly modeled climate data from the oregon state prism project. Comes in both image and ASCII grid format. Can be easily imported into Arcview/Arcinfo using ASCIIGRID command:
http://www.prism.oregonstate.edu/products/matrix.phtml?vartype=tmax&view=data
Mapping Web Trends
Below is a link to a beautiful map of current web(site) trends superimposed on a schematic of the Tokyo Metro Map:
http://www.informationarchitects.jp/slash/iA_WebTrends_2007_2_1600×1024.gif
Mapping Tigers,Jaguars and Crocodiles
The Wildlife Conservation Society has a few GIS datasets available with species ranges for endangered species (currently tigers, american crocs and jaguars with more to come):
Bird and Mammal Distribution Areas
natureserve.org contains tons of polygon and point data displaying the distribution areas for mammals, birds and other eco data. Plant distribution may be available at a later date
Shadowmaker
This is an awesome tool that will create a google maps style shadow icon for your base icon.
http://www.cycloloco.com/shadowmaker/
Tree Species Distribution Shapefiles
The following link contains shapefiles for download containing native range/distribution areas for various North American trees and plants.
“Maps of the ranges of tree species in North America compiled by Elbert Little, of the U.S. Department of Agriculture, Forest Service, and others (see references below) were digitized for use in USGS’ vegetation-climate modeling studies. These digital map files are available here for download.”
http://esp.cr.usgs.gov/data/atlas/little/