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Recent WordPress versions show a black AdminBar when you're logged in - you could add buttons here to make some admin tasks easier.
For Tweaking4All I needed buttons to make moderating comments easier, and below you will see how I did that. You'll need to add the function to the functions.php file.
function adminbar_add_t4aButtons( $wp_admin_bar ) {
$url = admin_url( 'edit-comments.php?comment_status=moderated' );
$args = array(
'id' => 't4a_nl_pending',
'title' => 'Modereer',
'href' => $url,
'meta' => array('target' => '_self')
);
$wp_admin_bar->add_node($args);
}
add_action( 'admin_bar_menu', 'adminbar_add_t4aButtons', 999 );
As you can see, first we build an URL to one of the admin pages, in this case the overview of comments awaiting moderation - we use the function admin_url() followed by "edit-comments.php?comment_status=moderated", which is the link to the pending comments page. You can use any link you'd like, this is just an example.
We glue all this into an array with id (unique name), title (button text), href (the link), and meta (in this case so the link opens in the same browser tab).
Next we add the array to $wp_admin_bar so WordPress knows about it.
You can repeat the array and $wp_admin_bar stepts in the same function, as many times as needed.