Apologies for not being able to post in the original thread. A few weeks ago, Florian Streibelt posted his research paper using the EDNS client subnet extension. I am a PhD student at USC and have been doing similar work. Using EDNS and techniques we developed, we found Google has been rapidly expanding where is serves search from: http://nsl.cs.usc.edu/~mcalder/animatedmap.gif (10 MB). For data and more details, see project page http://mappinggoogle.cs.usc.edu and tech report available at http://www.cs.usc.edu/assets/006/86340.pdf. I believe that updated versions of both papers will be appearing at the Internet Measurement Conference in the fall. We'd love any feedback from you or from anyone on dnsop as we revise the paper for IMC and as we continue related work going forward.
As a follow up to a question in the original thread, there are also number of smaller CDNs which have invested in ECS such as CDN77, ChinaCache, CacheFly and EdgeCast. There is a decent intro to edns-client-subnet at http://www.cdnplanet.com/blog/which-cdns-support-edns-client-subnet/. Cheers! Matt
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