Post Gallery list attachments except the one used as post thumbnail

You can use the exclude parameter.

global $post;
$args = array(
    'exclude' => get_post_thumbnail_id( $post->ID )
    'post_type' => 'attachment',
    'post_mime_type' => 'image',
    'numberposts' => -1,
    'orderby' => 'menu_order',
    'order' => 'ASC',
    'post_parent' => $post->ID
);
$images = get_posts($args);

http://codex.wordpress.org/Template_Tags/get_posts
http://codex.wordpress.org/Function_Reference/get_post_thumbnail_id

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