WP To Top (wp-to-top) free WordPress plugin

This plugin will add a “Back to top” icon automatically to your blog. It features a smooth scrolling effect and customizable options such as the color, position and scroll duration, sprinkled with some cool CSS3 effect.

By Asvin Balloo.

Supported features:

• Smooth scrolling animation
• Customizable options via the admin panel
• Works on almost all browsers
• No need to add any markup to your theme