He conseguido sacar el id, titulo de la pagina, y bastantes cosas como:
[ID] => 54
[post_author] => 1
[post_date] => 2011-03-16 18:52:41
[post_date_gmt] => 2011-03-16 18:52:41
[post_content] => innologiht
[post_title] => Innolight
[post_excerpt] =>
[post_status] => publish
[comment_status] => open
[ping_status] => open
[post_password] =>
[post_name] => innolight
[to_ping] =>
[pinged] =>
[post_modified] => 2011-03-16 20:17:50
[post_modified_gmt] => 2011-03-16 20:17:50
[post_content_filtered] =>
[post_parent] => 49
[guid] =>
http://localhost/web/?page_id=54
[menu_order] => 0
[post_type] => page
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
Pero realmente no estoy dentro del loop, lo hago con get_page_children() que me devuelve un array con todas las paginas hijas. Entonces no funciona <?php the_post_thumbnail(array(50,50)); ?> por ejemplo...