Suggest posts on 404 pages

possibly_related_posts.php

function possibly_related_posts() {
	if ( ! is_404() )
		return;

	$uri = esc_url( $_SERVER['REQUEST_URI'] );
	$uri = array_pop( explode( '/', $uri ) );

	$search = trim( preg_replace( '@[_-]@', ' ', $uri ) );
	$posts = get_posts( array( 's' => $search ) );

	if ( count( $posts ) == 0 )
		return;

	$related = "<h2>Maybe these will help?</h2>";
	$related .= "<ul>";
	foreach ( $posts as $post ) {
		$title = $post->post_title;
		$permalink = get_permalink( $post->ID );
		$related .= "<li><a href='$permalink'>$title</a></li>";
	}
	$related .= "</ul>";

	echo $related;
}

Added to v11 in 493afdf

That's joshbetz/v11@493afdf