geoserf.com

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

a2a_linkname=”Prism Climate Data”;
a2a_linkurl=”http://geoserf.com/?p=16″;

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
Birds of North America
Mammals of North America

a2a_linkname=”Bird and Mammal Distribution Areas”;
a2a_linkurl=”http://geoserf.com/?p=6″;