The Economics of Free
Wired's editor-in-chief Chris Anderson is working on a new book, to be published next year, about the idea of "free" in the old and new economies. Wired is running a long excerpt from the book and some sidebars about the economics of giving away, e.g., CDs and directory assistance. Techdirt has a few quibbles about Anderson's ideas — mostly areas in which he may be shading the argument to sell more books — but mostly buys that the equations of economics continue to work when zeros are plugged in in judicious places.
I think you should create a new word for free (as in speech). Free is too ambiguous and may be pejorative (as in no value).
Why not use the French word "libre". It is already well known.