Hello,
Currently I'm using a somewhat modified version of the Dashboard: Scheduled Posts plugin.
Running WordPress 3.1.3 it seems to be a bit out of date giving me an Undefined index notice.
The code:
<?php
/*
Plugin Name: Dashboard: Scheduled Posts
Plugin URI: http://www.viper007bond.com/wordpress-plugins/dashboard-scheduled-posts/
Description: Displays scheduled posts on your WordPress 2.7+ dashboard.
Author: Viper007Bond
Version: 2.0.0
Author URI: http://www.viper007bond.com/
*/
class DashboardScheduledPosts {
	function DashboardScheduledPosts() {
		if (!current_user_can('edit_posts'))
			return;
		load_plugin_textdomain('dashboard-scheduled-posts', FALSE, '/dashboard-scheduled-posts');
		add_action('admin_head', array(&$this, 'css'));
		add_action('wp_dashboard_setup', array(&$this, 'register_widget'));
		add_filter('wp_dashboard_widgets', array(&$this, 'add_widget'));
	}
	function register_widget() {
		wp_register_sidebar_widget('dashboard_scheduled_posts', __('Scheduled', 'dashboard-scheduled-posts'), array(&$this, 'widget'));
	}
	function css() {
		?>
		<style type="text/css">
			#dashboard_scheduled_posts ul {
				margin: 0;
				padding: 0;
				list-style: none;
			}
			#dashboard_scheduled_posts ul li {
				margin-bottom: 0.6em;
			}
			#dashboard_scheduled_posts h4 {
				font-weight: normal;
			}
			#dashboard_scheduled_posts h4 abbr {
				font-family: "Lucida Grande", Verdana, Arial, "Bitstream Vera Sans", sans-serif;
				font-size: 11px;
				color: #999;
				margin-left: 3px;
			}
			#dashboard_scheduled_posts p {
				margin: 0;
				padding: 0;
			}
		</style>
		<?php
	}
	function add_widget($widgets) {
		global $wp_registered_widgets;
		if (!isset($wp_registered_widgets['dashboard_scheduled_posts']))
			return $widgets;
		$widgets[] = 'dashboard_scheduled_posts';
		return $widgets;
	}
	function widget() {
		$futures_query = new WP_Query(array(
			'post_type' => array(
				'post',
				'page'
			),
			'what_to_show' => 'posts',
			'post_status' => 'future',
			'posts_per_page' => 5,
			'orderby' => 'date',
			'order' => 'ASC'
		));
		$futures =& $futures_query->posts;
		if ($futures && is_array($futures)) {
			$list = array();
			foreach ($futures as $future) {
				$url = get_edit_post_link($future->ID);
				$title = _draft_or_post_title($future->ID);
				$item = "<h4><a href='$url' title='" . sprintf(__('Edit "%s"'), esc_attr($title)) . "'>$title</a> <abbr title='" . get_the_time(__('Y/m/d g:i:s A'), $future) . "'>" . get_the_time(get_option('date_format'), $future) . '</abbr></h4>';
				if ($the_content = preg_split('#\s#', strip_tags($future->post_content), 11, PREG_SPLIT_NO_EMPTY))
					$item .= '<p>' . join(' ', array_slice($the_content, 0, 10)) . (10 < count($the_content) ? '…' : '') . '</p>';
				$list[] = $item;
			}
			?>
			<ul>
				<li><?php echo join("</li>\n<li>", $list); ?></li>
			</ul>
			<p class="textright"><a href="edit.php?post_status=future&post_type=post" class="button"><?php _e('View all scheduled posts'); ?></a> <a href="edit.php?post_status=future&post_type=page" class="button"><?php _e('View all scheduled pages'); ?></a></p>
			<?php
		} else {
			_e('There are no scheduled posts at the moment', 'dashboard-scheduled-posts');
		}
	}
}
add_action('plugins_loaded', create_function('', 'global $DashboardScheduledPosts; $DashboardScheduledPosts = new DashboardScheduledPosts();'));
?>
The notice:
Notice: Undefined index: dashboard_scheduled_posts in /home/design24/public_html/klanten/23/wp-admin/includes/dashboard.php on line 120
A fix for this would be more than appreciated.			
Utkarsh Kukreti answers:
								Try changing
		wp_register_sidebar_widget('dashboard_scheduled_posts', __('Scheduled', 'dashboard-scheduled-posts'), array(&$this, 'widget'));
to
		wp_add_dashboard_widget('dashboard_scheduled_posts', __('Scheduled', 'dashboard-scheduled-posts'), array(&$this, 'widget'));							
cor comments:
Which is the correct answer (: Thanks Utkarsh!
Fahad Murtaza answers:
								Check if your wp-config.php has this
define('WP_DEBUG',false);
if not, please add.							
cor comments:
										Hello Fahd,
I am aware it's possible to <em>hide</em> errors. They'll still remain as errors though.
The reason I'm asking for paid support is to have these fixed.									
Julian Lannigan answers:
I installed this plugin on my sandbox environment with no error. I suggest trying this plugin: [[LINK href="http://wordpress.org/extend/plugins/future-dashboard-widget/"]]Future Dashboard Widget[[/LINK]]. This one hasn't been updated in a awhile either but, it's last update was more recent then the [[LINK href="http://wordpress.org/extend/plugins/dashboard-scheduled-posts/"]]Dashboard: Scheduled Posts[[/LINK]].
cor comments:
										Hi Julian,
Thank you for your reply, but having define('WP_DEBUG',false); I'm getting this notice:
Notice: Use of undefined constant futurewidget_init - assumed 'futurewidget_init' in /home/design24/public_html/klanten/23/wp-content/plugins/future-dashboard-widget/futurewidget.php on line 26									
cor comments:
										Sorry, I did mean define('WP_DEBUG',true);