Four Papers On Henry George

I have never been enamored of Henry George. But for those who like him, the recent History of Economics Society Annual Conference (Denver, CO, 26-29 June 2009) had a session on "Henry George and the Concept of the Commons", with four papers:

• Lew Daly, "Creation Ethics and the Distribution of Wealth from Genesis to Cyberspace"
• Neil B. Niman, "Henry George and the Intellectual Foundations of the Open Source Movement"
• William S. Peirce , "Allen Ripley Foote and the Revenues for the Progressive State"
• Francis Peddle, "Henry George and the Open Knowledge Commons"

I guess one can get the following from George: Many do not legitimately contribute to production, but merely charge those who do work a toll for access to the property with which they work. I can get the same idea, however, from P. J. Proudhon's What is Property?; Karl Marx's idea of the worker's "double freedom" (in chapter VI of Capital, Volume 1) to sell his labor power and of ownership of other commodities for sale; and of Thorstein Veblen's concept of business as sabotage, in contrast to industry. What do I need Henry George for, at least with respect to this idea?