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I tried the Following (whihc lists custom post types called Static Content):

 <?php

add_action("widgets_init", array('Widget_name', 'register'));
class Widget_name {
  function control(){
        $custom_posts = new WP_Query();
        $custom_posts->query('post_type=page_content&page_sections=Lastest');
        while ($custom_posts->have_posts()) : $custom_posts->the_post();
    ?>
    <div class="block-7 border-top">
        <h2><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyten' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2>
        <a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyten' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_post_thumbnail(); ?></a>
        <p><?php the_excerpt(); ?></p>
    </div>
    <?php endwhile;
  }
  function widget($args){
    echo $args['before_widget'];
    echo $args['before_title'] . 'Your widget title' . $args['after_title'];
    echo $args['after_widget'];
  }
  function register(){
    register_sidebar_widget('Widget name', array('Widget_name', 'widget'));
    register_widget_control('Widget name', array('Widget_name', 'control'));
  }
}

?>

But no luck. There's nothing displayed in the widget.

Any suggestions?

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2 Answers 2

Here is a plugin by @Jared that does exactly what you need,
http://new2wp.com/pro/latest-custom-post-type-posts-sidebar-widget/

look at line:105

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is it really that hard to accomplish that I need a plugin? –  janoChen Feb 6 '11 at 19:34
    
@janoChen i suggest the link to take a look in the code to understand how to do it better, in your way. Its just a widget –  Philip Feb 6 '11 at 19:41
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Figured out how (Thanks to Wordpress Codex):

    /** @see WP_Widget::widget */
    function widget($args, $instance) {
        extract( $args );
        $title = apply_filters('widget_title', $instance['title']);
        ?>
              <?php echo $before_widget; ?>
                  <?php if ( $title )
                        echo $before_title . $title . $after_title; ?>
                    <?php // Create and run custom loop
        $custom_posts = new WP_Query();
        $custom_posts->query('post_type=page_content');
        while ($custom_posts->have_posts()) : $custom_posts->the_post();
    ?>
            <h2><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyten' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2>
    <?php endwhile; ?>

              <?php echo $after_widget; ?>
        <?php
    }

    /** @see WP_Widget::update */
    function update($new_instance, $old_instance) {
    $instance = $old_instance;
    $instance['title'] = strip_tags($new_instance['title']);
        return $instance;
    }

    /** @see WP_Widget::form */
    function form($instance) {
        $title = esc_attr($instance['title']);
        ?>
            <p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?> <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" /></label></p>
        <?php
    }

} // class FooWidget

// register FooWidget widget
add_action('widgets_init', create_function('', 'return register_widget("FooWidget");'));
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