I just recreated Akismet widget using WP_Widget class

akismet-widget.php

<?php
/**
 * Create widget for Akismet stats
 *
 * @package Akismet
 */

class Widget_Akismet extends WP_Widget {

	function Widget_Akismet() {
		$widget_ops = array( 'classname' => 'widget_akismet', 'description' => 'Akismet stat widget' );
		$this->WP_Widget( 'akismet', 'Akismet', $widget_ops );
	}
	
	// Display the widget
	function widget( $args, $instance ) {
		extract($args);
		$title = apply_filters( 'widget_title', empty( $instance['title'] ) ? 'Akismet' : $instance['title'] );
		$count = get_option( 'akismet_spam_count' );
		
		echo $before_widget;
		if ( $title )
			echo $before_title . $title . $after_title;
?>
			<div id="akismetwrap"><div id="akismetstats"><a id="aka" href="http://akismet.com" title=""><?php printf( _n( '%1$s%2$s%3$s %4$sspam comment%5$s %6$sblocked by%7$s<br />%8$sAkismet%9$s', '%1$s%2$s%3$s %4$sspam comments%5$s %6$sblocked by%7$s<br />%8$sAkismet%9$s', $count ), '<span id="akismet1"><span id="akismetcount">', number_format_i18n( $count ), '</span>', '<span id="akismetsc">', '</span></span>', '<span id="akismet2"><span id="akismetbb">', '</span>', '<span id="akismeta">', '</span></span>' ); ?></a></div></div>
<?php
		echo $after_widget;
	}
	// Save widget settings
	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;
		$instance['title'] = strip_tags( $new_instance['title'] );
		
		return $instance;
	}
	
	// Build Akismet widget settings form
	function form( $instance ) {
		$instance = wp_parse_args( (array) $instance, array( 'title' => '' ) );
		$title = strip_tags( $instance['title'] );
?>
		<p><label for="<?php echo $this->get_field_name( 'title' ); ?>"><?php _e( 'Title' ); ?></label> <input class="widefat" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" /></p>
<?php
	}
}
// Register Akismet widget function
function akismet_widget_init() {
	register_widget( 'Widget_Akismet' );	
}

add_action( 'widgets_init', 'akismet_widget_init' );

// Register styles for akismet widget
function akismet_widget_style() {
	$url = plugins_url( '/akismet-widget.css', __FILE__ );
	
	wp_enqueue_style( 'akismet_widget', $url );
}

add_action( 'wp_enqueue_scripts', 'akismet_widget_style' );