I've just started up a list of clusters with >=32 cores using Gentoo [1] that I found using Google. It should show up on the web nodes in roughly an hour. If you have any to add to the list, or corrections or updates to it, please let me know.
Everything currently on the list is clearly public information since Google found it for me. =) Thanks, Donnie 1. http://www.gentoo.org/proj/en/cluster/
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