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PREHISTORIC LINKS

Erm, the links aren't prehistoric, 

the subject matter is.

 

General Neanderthal Cro-Magnon

General

PaleoNet

Anthropology.net

Paleoanthropology Links and more Paleoanthropology Links 

Past Horizons: Adventures in Archeology.

Zooarchaeology Comparative Collection Databases -- From the Florida Museum of Natural History.

Prehistory pages from Minnesota St. University.

Extensive web links for everything from Australopithecines to Cro Magnon. From the web notes for History of Life, 3rd ed.
Stone Age Resources: Links page. Many links are as dead as the fossils they talked about.
"Skeletons in Your Closet": a brief overview of early hominids, from an online anthropology course.
The Leakey Foundation is committed to research related to human origins.
Stone Age Reference Collections: an excellent reference on tools and techniques, from the University of Oslo.
Schöningen Spear Project: 400,000 year old spears.
Primitive Ways deals with recreating primitive technologies. 
Flintsource: identifying the geographic origins of prehistoric artifacts in Europe. 
The Lithics Site: a resources for archeological lithic analysts.
Society of Primitive Technology
Primitive technology and reenactment links.
Institute for Ice Age Studies 
Early Man: Where did early man begin, and why?
Laboratory for Experimental Archeology: nice site, but in Italian. 
Anthropology Resources
Paleontological Research Institute.
Articles: Dominance war in Britain - 400K years ago?
Prehistorics Illustrated
PaleoPlanet forum
Paleoclimate Modelling Intercomparison Project. And PMIP Phase 2.
Global land environments since the last interglacial. From the Review and Atlas of Paleovegetation.
Don's Maps: A collection of resources for paleolithic Europe, Russia, and Australia.
Bibliography of prehistoric fiction.
Occoquan Paleotechnics: Replicas and castings of stone points and other primitive technology.

Neanderthals

And while I learned it as "Neanderthal", I'm getting the impression that it's in vogue to drop the "h".

Who Were the Neandertals? is a good introduction to these ancient peoples, and includes more about the (still ongoing!) debate on the relationship between the Neanderthals and us.  From the Earth and Sky website.

The Neanderthal Wikipedia article, including many links.

The web-page of the museum at the site where Neandertals were discovered.

Neandertals: A Cyber Perspective is a good source for information on the folks we can't decide if we descended from (we all have relatives like that, I'm sure).

In Search of Neanderthals
Maps, articles and photos related to Mousterian sites.

Were Neanderthals the Ancestors of Modern Humans?

Another article about Neanderthal DNA findings, from ABCNews.

Giving voice to the Neanderthal: Evidence on Neanderthal speech.

Extensive Neanderthal web links. 
The Neanderthal Paradigm, by Valerius Geist.
A summary and transcript of a BBC show about Neanderthals -- specifically, determining such things as strength, intelligence and vocal capability based on anatomical evidence.
Neanderthal fact files from the BBC.
The Gibraltar Caves -- possibly the last Neanderthal holdouts.
Mousterian Artifacts.
Abstract for a project Thoughtful Hunters? The Archaeology of Neandertal Communication and Cognition

Cro-Magnon

Wiki article on Cro-Magnons.
 Cave Art
Official websites for the Lascaux Cave and Chauvet Cave

Face Carvings in Caves

Cave paintings of France from the Bradshaw Foundation.
Don's pages on Chauvet, Lascaux, Grotte de Niaux, and Grotte de Cussac