martinibuster - 1:06 am on Mar 2, 2010 (gmt 0)

>>>When G filters out duplicate content it allocates the link juice to the original version doesn't it?

No, it does not. Google attempts to identify the original version, That's it. There is no allocation of "link juice."

>>>assuming G singles out the right copy as original....

It's arguable that Google can do that. If I were handing out grades for Google's ability to identify the original source I would give Google a C-, almost a D.