Great post and great articles and responses. I have to bookmark this fascinating stuff.
If "modern" man managed to get to Australia possibly 60,000 years ago http://cogweb.ucla.edu/ep/Mungo_Man.html
it is inconceivable to me that modern man didn't manage to reach the Americas well before Clovis.
I think Clovis Man was responsible for the extinction of the Ice Age Megafauna, but there must have been eons of existance of "modern" man and the megafauna together before Clovis technology and the human population density reached the point it could accomplish this.
They found an 80k YO well-worn shell necklace with the 'Hobbits' on Flores Island. BTW, Flores Island was an island during the entire Ice Age. That means the 'Hobbits' survived the Toba near-extinction event 74,000 years ago.