How has Internet Peering changed over the past 10 years or so?
The Internet Peering Ecosystem in the U.S. has changed significantly from 1987 to 2000, and even more significantly from 2000 to 2012. Much of this is documented in "The 21st Century Internet Peering Ecosystem" but you might also find interesting the differences between the U.S. Internet Peering Ecosystem and those found across Asia as described in "The Asia Pacific Peering Guidebook" where I document how peering in Asia is different from peering elsewhere in the world.
If I was to generalize about the peering scaffolding, I would say that we have seen churn (companies abandoning peering as a tactic) in the U.S. Internet Peering Ecosystem as the result of these trends:
As fast a companies leave, new companies join.
And there is the shift in the power dynamics in the emerging Internet Peering Ecosystem:
I would say that these are some of the more significant changes in the peering world. Other than these, the pipes get bigger and the prices continue to drop, and more peering locations pop up. Many peering locations will fail because they do not understand the essentials of spinning up an IXP, or they do not have the proper concoction (carriers, transport options, transit prices, Tier 2 ISPs, CDNs andContent Players, eyeball networks, etc.) in their Internet Peering Ecosystem.