Certain WordPress plugins hijack your back and front end admin bar. Kick them out with this plugin.
Some plugins like to embed themselves into the default WordPress admin bar. Some developers and their clients dislike this.
Plug-ins that do this are:
Remove all or any of these from your admin bar with this plugin.
If you find this plug-in just so totally awesome that you develop a massive urge to donate, feel free to donate here: http://wordpressfoundation.org/donate/
All and any feedback - post it on the forum or email firstname.lastname@example.org