User blog comment:Susanolivia/Fixed Width, Sidebar, and the Removal of Monaco/@comment-1357348-20101001025644/@comment-4713673-20101001191736

If you have a more specific question I'm happy to help answer it. :) If it's a "why" the change in general that's what this post is helping to address and you can also find a lot of information in the FAQ's as well. http://www.community.wikia.com/wiki/The_new_look