Facebook appears to have just launched a previously announced feature to their new design staging area. If you go there you’ll notice a new little “+” sign next to the tabs at the top. Click on this, and now you can choose to add “Posted Items” to the tabs at the top, as well as “Find more applications”. The “Find more applications” feature does not seem to be working yet.
See below for some more examples of the new “+” sign, and adding the Posted Items application to the tabs menu in the new design: