Some empirical research on the Labor Theory of Value.

Here are some interesting pdfs on the empirical strength of the LTV.  People who believe that Austrian, marginalist economics can be absolutely proven a priori need to ask themselves: If price tends to gravitate toward the cost of labor in actual markets in a way that is empirically provable, is there something wrong in your a priori analysis?

• Labour value and equalisation of profit rates: a multi-country study - Dave Zachariah http://reality.gn.apc.org/econ/Zachariah_LabourValue.pdf
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• Testing the labor theory of value in Sweden - Dave Zachariah http://reality.gn.apc.org/econ/DZ_article1.pdf 
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• The empirical strength of the labor theory of value - Anwar M. Shaikh http://homepage.newschool.edu/~AShaikh/labthvalue.pdf
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• The Scientific Status of the Labour Theory of Value - W. Paul Cockshott and Allin Cottrell http://www.wfu.edu/~cottrell/eea97.pdf