z720

This plugin tries to enable previous feature present in DashBar in the new WordPress Admin Bar.
No more options, only contextual links missing in the admin bar:
<ul>
<li>Choose from the list of posts displayed to edit one</li>
</ul>
Network admin is also accessible from the first menu
No more localization required as this plugin uses core WordPress text.
WARNING: This plugin requires PHP 5.

DashBar

This plugin tries to enable previous feature present in DashBar in the new Wordpress Admin Bar.

xxxx7

This plugin adds Theme menus in the admin bar. 
You can switch and activate the theme on the admin bar. 
You don’t need to go to the administration screens to switch the theme.
(For Japanese User) 管理バーにテーマメニューを追加します。 管理バー上でサイトテーマの変更・有効化が行えます。 テーマを変更するために管理画面に行く? 要がなくなります。

Switch theme on admin bar

This plugin adds Theme menus in the admin bar. You can switch and activate the theme on the admin bar.

DashBar vs Switch theme on admin bar