UserToolbar (or uBar for short) is an extension built with the user in mind. It provides links and tools to help visitors with your site.
Through a discrete tool bar at the bottom or on either sides of the window (similar to the one at the bottom of this window), users can search for keywords, take notes and save them until the next visit, or hide the bar if it's not being used. uBar is compatible with Linkr, JoomFish (soon), Community Builder , Joomunity , and other extensions.
NOTE: uBar in still in the testing phase, and might be a little buggy for some users!
You can showcase your toolbar and find help in the uBar forum.