When we originally posted the challenge we weren't even sure it was possible to meet the requirements. However, once again the crowd proves how #superfreakinawesome it is! It was amazing how each person took a different approach to the problem.
kyleisidorey took an interesting approach to the challenge. He wrote a Google Chrome extension that overrode the entire Chatter profile page with a custom Visualforce page and controller which gives you the freedom to display whatever you want on the page.
Kenji776 went an interesting route and implemented a Force.com Sites Visualforce page and controller that injected JSON content into a user's Chatter profile page. It therefore kept the existing Chatter functionality but allows additional markup to be inserted.
But the winner was fractastical with, once again, a very elegant jQuery approach. Here's the video that he submitted with his code:
So the final roundup for the challenge is:
Congrats to everyone who participated!