[Zope] OT:looking for info/ideas on "Open Source Business Models"

Hi all, I am going to give a speech on "Open Source Business Models" for which I am searching ideas and concepts. What I would like to show is why and where OSS provides a better base to make business than closed source. A main focus should not be how to provide "big" software packages like Zope/ Mysql/et al but on what business could be buildt around them. Any Ideas and pointers would be greatly appreciated. Robert