I have two complaints on the new improvements of the site navigation.
I really see no point in the new fancy source code "window". I always have to move it and resize to be able to view the code. I think it was better before.
One more thing - when switching between rank pages, it's no more loading a new URL, but it loads a new page at the same place. I don't see any pros over the old style, and sometimes this behaviour is quite annoying. For example, in submission ranks I click on page #23, click a user name and then go back - great, it returns to page #1, not #23.