ToTop Link is a simple plugin for WordPress that adds an unobtrusive “back to top” link to your site or blog. The link uses WordPress’ included jQuery to provide a slick UX, with the link subtly appearing after the page has been scrolled, and disappearing once the user returns to the top of the page. Additionally, a smooth scrolling animation is added when the link is clicked on.
Plugin homepage: http://www.daobydesign.com/free-plugins/totop-link-for-wordpress/
Download: http://wordpress.org/extend/plugins/totop-link/
