Love your poem Floatbox! It's beautiful! I especially enjoyed the lines about neurons demanding respect of their institutions. This essentially sums up the entire industrial period.

how does capitalism and it's tendency to concentrate power in certain cases (eg: military industrial complex) fit into your vision of decentralized everything?

Well, it's not quite clear to me how the economy will be restructured... but I am confident with a few variables:

a) Everyone will have more disposable income (because of more energy and more decentralized government which will prevent massive wealth inequality)

b) A more advanced internet + more mature internet culture + our generation with more wealth = a good future for crowd sourcing of all kinds

In terms of the military - I don't see defence being necessary in the conventional sense. I see a trend towards more things we would call "terrorism" and less nation-state wars. This will require a major shift in how we organize our military and our defence systems in general.

What is the organizing principle integrating the disparate parts?

The concept of the Global Brain relies on an understanding of self-organizing principles. The mechanism of self-organization will likely be through a social media that is quite intimately connected to our physical reality. We will be able to know what agents in the system are reliable, dependable, credible, efficient, effective, etc. just from their social media history/profile/statistics/reputation which will all be immediately knowable.

These are all great questions - I don't know if I have the best answers for them yet. It would probably make for a great hangout/discussion.