Here's an interesting video about the conflict between developers and publishers in the games industry that has always been a delicately poised relationship but has become big news recently due to the fall out between Call of Duty developers, Infinity Ward, and their publishers, Activision.
Here's a couple of other resources which might help get your head around Media Ownership, but they don't focus on the games industry. Here's a vid on how Media Ownership (and synergy to a degree) has help the band The Fray and an article on how the mass media is split up in terms of ownership between 6 multi-national companies.