So, perhaps I am just a very strange person, but when I see a nightmarishly efficient double skeleton spawner, I need something to do to keep my mind occupied while I wait for it to do its thing. And we do need more good design in the mining world, don't we? I do have one complaint, though... it's hard to build when they won't stop shooting at you. Skeletons have no respect for workmanship.
Since Mike has Investigator, it will be interesting to see if a) the spawner remains active for the entire month or b) who the person is that finds it and destroys the spawners. If it IS destroyed, I believe the destroyer's name should be published... *evil grin*