Abenaki

A good overview of the Western, Eastern and Southern Abenaki (New England, Northeast America):

Abenaki

NA Resources on the Internet

Great link source for resources organized mostly by geographical area:
Index of Native American History Resources on the Internet

Population Pre-Columbus?

U.S. News 08/18/97: How many people were here before Columbus?

Utah's Untouched Ancient Ruins

NPR audio report:

NPR : Utah Unveils Untouched Ancient Indian Ruins