You need a footer for convention purposes. A user can click on a link from the bottom of the page without having to scroll to the top for the navigation. It therefore helps with accessibility.
Also, a search engine reads site from the bottom up, meaning that it will access your footer matirial first. For that reason you should put simple links to Home, Feedback, News, Answers, Info, Contact Us. The search engine will then go to these pages in addition to your home page.
Finally, from a design standpoint, it just looks like your site's page just 'ends' with no formal closing. A simple footer with links will look nice. You can also add copywrite notice here.