Create a widgetized area for every top level page in WordPress.

functions.php

/**
 * Create widgetized sidebars for each page
 */
function xxx_custom_page_sidebars() {
	$pages = get_pages( array(
			'parent' => 0
		)
	);

	foreach ( $pages as $page ) {
		register_sidebar( array(
			'name' => $page->post_title,
			'id' => 'sidebar-' . $page->post_name,
			'description' => 'This is the widgetized area for the \'' . $page->post_title . '\' page.',
			'before_widget' => '<aside id="%1$s" class="widget %2$s">',
			'after_widget' => '</aside>',
			'before_title' => '<h3 class="widget-title">',
			'after_title' => '</h3>',
		));
	}
}

add_action( 'widgets_init', 'xxx_custom_page_sidebars' );