If you use your browser in a small window, you may have not noticed the extra white space that the Google+ redesign introduced. Maximize your browser window, and you'll see that the layout of Google+ is justified to the left and a whole lot of white space exists to the right.
Apparently, the design was intentional to allow flexibility for future use, but for those of you who dislike the imbalanced layout, there's a solution.
Whitespace Remover for Google Plus is a Chrome and Firefox extension that centers the layout so all the white space isn't on just one side of the screen. The name of the extension is a little misleading, since it doesn't really remove the white space -- it just shifts it and turns it gray. However, some users may prefer this layout, especially those with wide-screen monitors.
That's it. Hopefully, Google does end up using the extra space with new features in the near future, but until then, the extension should remain useful.