BBC
Bbc: North America's First People
Easy-to-understand explanations for the theories revolving around first Americans. Each theory: Clovis First and Pacific Coast Route, is explained as well as the basis for the debate.
Other
Live Science: First American Settlers Not Who We Thought
This article discusses findings that point to a pre-Clovis, New-World-humans model through artifacts dug up at various archaeological spots thoughout the Americas.