I found a really great discussion on Monomer-Dimer tatami tilings and up-voted it. However, it doesn't really have a question or answers. It's still a great read.
It's not the first time I've seen knowledge-dumps into MathOverflow in the guise of questions. (For some reason tilings are a frequence source of such posts.)
MathOverflow as it currently stands, is not always amenable to discussions or open-questions, as evidenced by the occasional closed questions.
Quora recently introduced a blogging feature, although it is build for philosophical and open-ended questions. And other users can vote on it.
I wonder if any thought has been put into incorporating such a feature into MathOverflow where such posts would certainly attract readers and commentary.