Some starter WordPress code for saving pages/posts as favorite.

cf-favorites.php

<?php
/*
Plugin Name: Favorites 
Plugin URI:  
Description: Let users save posts/pages as favorites - then access them through a quick menu. 
Version: 1.0 
Author: Crowd Favorite
Author URI: http://crowdfavorite.com
*/

// 	ini_set('display_errors', '1'); ini_set('error_reporting', E_ALL);

if (!defined('PLUGINDIR')) {
	define('PLUGINDIR','wp-content/plugins');
}


load_plugin_textdomain('cf_favorites');

function cffp_favorites_list() {
// TODO show list
}

function cffp_list_pages() {
// TODO - conditionally add to page list
}

function cffp_add_favorite($url, $title) {
// TODO - should use ID instead?
}

function cffp_request_handler() {
	if (!empty($_GET['cf_action'])) {
		switch ($_GET['cf_action']) {
			case 'cffp_js':
				cffp_js();
				break;
			case 'cffp_css':
				cffp_css();
				break;
			case 'cffp_admin_js':
				cffp_admin_js();
				break;
			case 'cffp_admin_css':
				cffp_admin_css();
				die();
				break;
		}
	}
	if (!empty($_POST['cf_action'])) {
		switch ($_POST['cf_action']) {
			case 'cffp_add_favorite':
// TODO
// - catch title and URL
				die();
				break;
			case 'cffp_update_settings':
// TODO
// - catch array of titles and URLs and save new order
				cffp_save_settings();
				wp_redirect(trailingslashit(get_bloginfo('wpurl')).'wp-admin/options-general.php?page=cf-favorites.php&updated=true');
				die();
				break;
		}
	}
}
add_action('init', 'cffp_request_handler');

function cffp_js() {
	header('Content-type: text/javascript');
// TODO
	die();
}



function cffp_css() {
	header('Content-type: text/css');
// TODO
	die();
}

function cffp_admin_js() {
	header('Content-type: text/javascript');
// TODO
	die();
}

function cffp_admin_css() {
	header('Content-type: text/css');
?>
fieldset.options div.option {
	background: #EAF3FA;
	margin-bottom: 8px;
	padding: 10px;
}
fieldset.options div.option label {
	display: block;
	float: left;
	font-weight: bold;
	margin-right: 10px;
	width: 150px;
}
fieldset.options div.option span.help {
	color: #666;
	font-size: 11px;
	margin-left: 8px;
}
<?php
	die();
}

function cffp_enqueue_assets() {
	$u = trailingslashit(get_bloginfo('url'));
	if (is_admin()) {
		wp_enqueue_script('cffp_admin_js', $u.'?cf_action=cffp_admin_js', 'jquery');
		wp_enqueue_style('cffp_admin_css', $u.'?cf_action=cffp_admin_css');
	}
	else {
		wp_enqueue_script('cffp_js', $u.'?cf_action=cffp_js', 'jquery');
		wp_enqueue_style('cffp_css', $u.'?cf_action=cffp_css');
	}
}
// Run at 'wp' when conditionals like is_single() are available.
add_action('wp', 'cffp_enqueue_assets');

$cffp_settings = array(
	'cffp_' => array(
		'type' => 'string',
		'label' => '',
		'default' => '',
		'help' => '',
	),
	'cffp_' => array(
		'type' => 'int',
		'label' => '',
		'default' => 5,
		'help' => '',
	),
	'cffp_' => array(
		'type' => 'select',
		'label' => '',
		'default' => '',
		'help' => '',
		'options' => array(
			'' => ''
		),
	),

);

function cffp_setting($option) {
	$value = get_option($option);
	if (empty($value)) {
		global $cffp_settings;
		$value = $cffp_settings[$option]['default'];
	}
	return $value;
}

function cffp_admin_menu() {
	if (current_user_can('manage_options')) {
		add_options_page(
			__('Favorites Settings', 'cf_favorites')
			, __('Favorites', 'cf_favorites')
			, 10
			, basename(__FILE__)
			, 'cffp_settings_form'
		);
	}
}
add_action('admin_menu', 'cffp_admin_menu');

function cffp_plugin_action_links($links, $file) {
	$plugin_file = basename(__FILE__);
	if ($file == $plugin_file) {
		$settings_link = '<a href="options-general.php?page='.$plugin_file.'">'.__('Settings', 'cf_favorites').'</a>';
		array_unshift($links, $settings_link);
	}
	return $links;
}
add_filter('plugin_action_links', 'cffp_plugin_action_links', 10, 2);

if (!function_exists('cf_settings_field')) {
	function cf_settings_field($key, $config) {
		$option = get_option($key);
		if (empty($option) && !empty($config['default'])) {
			$option = $config['default'];
		}
		$label = '<label for="'.$key.'">'.$config['label'].'</label>';
		$htlp = '<span class="help">'.$config['help'].'</span>';
		switch ($config['type']) {
			case 'select':
				$output = $label.'<select name="'.$key.'" id="'.$key.'">';
				foreach ($config['options'] as $val => $display) {
					$option == $val ? $sel = ' selected="selected"' : $sel = '';
					$output .= '<option value="'.$val.'"'.$sel.'>'.$display.'</option>';
				}
				$output .= '</select>'.$help;
				break;
			case 'string':
			case 'int':
			default:
				$output = $label.'<input name="'.$key.'" id="'.$key.'" value="'.$option.'" />'.$help;
				break;
		}
		return '<div class="option">'.$output.'<div class="clear"></div></div>';
	}
}

function cffp_settings_form() {
	global $cffp_settings;

// TODO - show list of favorites on admin page, allow removal - reorder of them

	print('
<div class="wrap">
	<h2>'.__('Favorites Settings', 'cf_favorites').'</h2>
	<form id="cffp_settings_form" name="cffp_settings_form" action="'.get_bloginfo('wpurl').'/wp-admin/options-general.php" method="post">
		<input type="hidden" name="cf_action" value="cffp_update_settings" />
		<fieldset class="options">
	');
	foreach ($cffp_settings as $key => $config) {
		echo cf_settings_field($key, $config);
	}
	print('
		</fieldset>
		<p class="submit">
			<input type="submit" name="submit" value="'.__('Save Settings', 'cf_favorites').'" />
		</p>
	</form>
</div>
	');
}

function cffp_save_settings() {
	if (!current_user_can('manage_options')) {
		return;
	}
	global $cffp_settings;
	foreach ($cffp_settings as $key => $option) {
		$value = '';
		switch ($option['type']) {
			case 'int':
				$value = intval($_POST[$key]);
				break;
			case 'select':
				$test = stripslashes($_POST[$key]);
				if (isset($option['options'][$test])) {
					$value = $test;
				}
				break;
			case 'string':
			default:
				$value = stripslashes($_POST[$key]);
				break;
		}
		update_option($key, $value);
	}
}

?>