With root, pir's .org and godaddy now all supporting dnssec, perhaps wikimedia domains can lead the way ? We would be the largest .org and being the only .org in the web property top 10, thus the largest website deployment in the world of dnssec, if I'm not mistaken.
Some planning advice:
http://www.securityweek.com/deploying-dnssec-four-ways-prepare-your-enterprise-dnssec
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