The SideBar enables the developer to have a floating toolbar that will assist on development. You can reinit the framework, clear the cache, clear the log files, clear some of the most used scopes like session and client, and so much more.
It also appends itself to errors when they occur, so you can easily reinitialize or search for the errors in the live docs or the forums. Yes, you can search right from the sidebar.
Another extra feature is that the links declared are all customizable, so you can customize your own sidebar according to your project, create internal or external links, or anything you like.
Another extra feature is that the sidebar is completely skinnable via css, so you can make it look pretty!! So skin it and send over your screenshots.