Let's wait until this go in production (first website is http://www.macmillandictionary.com) !
PowerDNS
We use PowerDNS for one of our new domain name. We plan to use the geo backend of PowerDNS to provide some geo-targeting feature and automatically redirect our fellows users to the closest server available. This was quite easy to setup. Once you have found a good PowerDNS administration tool (such as pdns admin), this is much easier.
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I am Pierre Baillet, senior software engineer. I write here mostly on computers and code, games, life and server stuff.