Vanilla 1.1.9 is a product of Lussumo. More Information: Documentation, Community Support.
http://mathoverflow.net/questions/8404/learning-tips-and-tricks-preludes-to-productive-days
Five votes are required the close, but a moderator "voting to close" has immediate effect.
The reason that this is a milestone is that it's the first question that would have been closed even without one of the voters being a moderator. It's a sign that MO is become "self-sustaining".
I think this is the first post closed entirely by non-moderators.
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