User blog comment:Sannse/Your First Look at the New Wikia/@comment-1514297-20100830123331/@comment-8-20100901184802

Yes, the content area is fixed width. So the side areas will be larger on larger screens. Fixed width vs. flexible width is a complicated question, with lots of arguments on both sides. Mostly, the question is between “this will look good on all screen resolutions because the content won’t break as the screen size changes” and “this will look good on all screen resolutions because the content will move to fit the screen”. For user generated content, there are strong advantages to knowing that whatever the editor’s screen size, they will produce articles that will work on everyone elses screen size. You will be able to add images to the side areas though, which looks really cool on the mock-ups I’ve seen (watch the blog for more on this later!)