We have just released the new free WordPress plugin that can help you manage WordPress websites - PE Theme Elements Info.
When plugin's activated, the small box above each widget gives you the info about sidebar name and #widget type so you can easily find it in WP backend.
Why the plugin is useful? For example:
- when you installed the demo copy of purchased #WordPress theme, and not familiar with its layout elements yet.
- when you manage many widgets located in many sidebars, this plugin can save you much time.