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

The Plugin adds a simple keyboard shortcut for mac and windows, and allows you to hide or show the adminbar in the frontend, very handy for themes using a sticky navigation. 
It is the smaller brother of my plugin <a href="https://wordpress.org/plugins/apermo-adminbar/" rel="ugc">Apermo AdminBar</a> which contains the same functionality and more advanced features.
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 Toggle

This plugin simple allows you to toggle the AdminBar on and off just with the keyboard.

Show/Hide Adminbar in WordPress 3.1 vs Apermo AdminBar Toggle