Q2W3 Fixed Widget, A click to make your sidebar ‘Sticky’
Simple as a few others
It's so light that you do not even realize it has it installed
Graphically it can still be improved
Q2W3 Fixed Widget is a simple plugin for an impressive utility that makes sticky widgets all you want to let them 'follow' while scrolling through the pages. Simplicity and Immediacy are their strengths, as soon as you activate the plugin and in the widget area you will find at the bottom of each widget an option to flag that makes the element 'sticky', nothing simpler for a great result!