This allows you to not only edit the layout of your front page, but to create new ones. Click for details.

Had some modules that you wanted to see now and then, but didn't want them to take up space on your front page? Create a new page to hold them. Now you can even edit the number of columns in each page. Your old page layout should stay the same during the transition, you won't lose anything. If you screw up the page layout too bad, just delete all of your pages and it will start you from scratch.