The people behind 1910 Design & Company took at stab at redesigning Wikipedia:
While big parts of the internet have gone through an amazing journey in terms of typography these last years, Wikipedia’s reading experience is still stuck in the 90’s. We wanted to take a few days and propose a direction through which Wikipedia could move forward, focusing on articles and reading without necessarily having to change too much of what it is and should continue to be.
I use Wikipanion for nearly all of my Wikipedia reading. Which is a lot. I’d welcome a redesign that helped make it much more readable than it currently is.