It's nice to have awareness of the challenge.
However, it's potentially confusing – especially for newcomers – to have Mountain Lion so prominent below the title of every question that is specifically not about Mountain Lion.
Placement in the midst of each question is not ideal.
Answers below assume that it will be possible (and relatively easy) to treat the challenge, or its banner, differently wherever a question:
– and so on.
This is admittedly a late suggestion, if there are only nine days left for this particular banner/challenge/competition, but it could be food for thought before the next banner is placed.