// Register Custom Template Widgets
class Post_Author_Widget extends WP_Widget {
    function Post_Author_Widget() {
        $widget_ops = array('classname' => 'postAuthor', 'description' => 'Displays the post author bio and gravatar.' );
        $this->WP_Widget('post_author', 'Post Author', $widget_ops);
    }

    function widget($args, $instance) {
        extract($args, EXTR_SKIP);

        echo $before_widget;
        echo get_author_bio();
        echo $after_widget;
    }

    function update($new_instance, $old_instance) {
        function update($new_instance, $old_instance) {
            $instance = $old_instance;

            return $instance;
        }
    }
}
register_widget('Post_Author_Widget');

class Blog_Author_List_Widget extends WP_Widget {
    function Blog_Author_List_Widget() {
        $widget_ops = array('classname' => 'authorList', 'description' => 'Lists blog contributors with gravatars and bio.' );
        $this->WP_Widget('author_list', 'The Bloggers', $widget_ops);
    }

    function widget($args, $instance) {
        extract($args, EXTR_SKIP);

        echo $before_widget;
        $title = '<span>The</span> Bloggers';
        echo $before_title . $title . $after_title;
        echo get_author_list();
        echo $after_widget;
    }

    function update($new_instance, $old_instance) {
        function update($new_instance, $old_instance) {
            $instance = $old_instance;

            return $instance;
        }
    }
}

Markup:

        <div class="blogger sidepost">
                <a href="<?php echo $user_link; ?>"><?php echo get_avatar($curauth->user_email, '80'); ?></a>
                <div class="author_text  clearfix">
                <h4><a href="<?php echo $user_link; ?>" title="<?php echo $curauth->display_name; ?>"><span>About</span> <?php echo $curauth->display_name; ?></a></h4>
                <p><?php echo $curauth->description; ?></p>
                </div>
        </div>