H. Peter Pfeufer

Provides a setting to show or hide the new admin bar in WordPress 3.1

Show/Hide Adminbar in WordPress 3.1

Provides a setting to show or hide the new admin bar in Wordpress 3.1

Christoph Daum

This plugin enhances the AdminBar and adds links to development, staging and live version of your website, furthermore it allows you to choose a color scheme of your AdminBar for all users on a website, including the frontend. 
You also have to option to control the robots.txt visibility settings, in the newest version you get a watermark for posts that are in draft or scheduled, and a keyboard shortcut to hide the adminbar.
If you want to participate in the development <a href="https://github.com/apermo/apermo-adminbar" rel="nofollow ugc">head over to GitHub</a>!

Apermo AdminBar

Every professional WordPress developer should have at least two environments when working on projects: development and production. But how often do you find yourself lost in these environments? @apermo done a great job solving this issue with this plugin. 

Conclusion: I can highly recommend this fantastic plugin!

Fantastic plugin!

This plugin helps tremendously if you want to switch between different versions of the website. (Staging, dev, live, etc.) 

Thank you!

Good Helper

This plugin allows you to add links between a development, staging and live version of your website, and adds them to the AdminBar.

Show/Hide Adminbar in WordPress 3.1 vs Apermo AdminBar