Weblogtools collection has published “Admin Bar Plugin Roundup” a useful article for those who want more/less or no admin bar, a new feature in WordPress 3.1.
We have found when upgrading to WordPress 3.1 from recent WordPress 3 versions different features appear in the new admin bar on different sites.
The article covers:
Admin Bar ID Menu
Debug Bar Console
Debug Bar Extender (requires the Debug Bar plugin)
Logged Out Admin Bar
WP Custom Admin Bar
read more at: http://weblogtoolscollection.com/archives/2011/03/03/admin-bar-plugin-roundup/