I was reminded of this [1] after seeing the Nexus price drop; it turns out it was removed from Apple.com on April 20 this year [2]. Odd, but you can still view it on archive.org.
[1] http://www.apple.com/hotnews/openiphoneletter [2] http://web.archive.org/web/*/http://www.apple.com/hotnews/openiphoneletter/