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I am glad that so many are optimistic and see it as easy. It is not. It's not an SQL friendly task and therefore quite cumbersome. After it has been implemented it will also be a resource hogger of our database servers on a recurring occasion.
Anyways. It has been implemented and will be released within a few days. The servers are currently working on preparing data for a few million geocachers. Sweden has already been calculated, as a test case.
A teaser screenshot was posted in our Facebook group.