The french association April (which turned 10 this year) has translated his work on "Economic Models of Freee Software" which it published originaly in french back in December 2007.
It is a very good introduction document to point CEO/CIOs to, when they ask themselves why embrace FLOSS, or how starting a FLOSS business.
PDF version: http://www.april.org/files/economic-models_en.pdf
ODT version: http://www.april.org/files/economic-models_en.odt
The french version is also of course available ;-)