Only show the authors posts in the edit list

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<?php

function mypo_parse_query_useronly( $wp_query ) {
    if ( strpos( $_SERVER[ 'REQUEST_URI' ], '/wp-admin/edit.php' ) !== false ) {
        if ( !current_user_can( 'level_10' ) ) {
            global $current_user;
            $wp_query->set( 'author', $current_user->id );
        }
    }
}

add_filter('parse_query', 'mypo_parse_query_useronly' );

?>

Instructions:

Insert this into your functions.php file.

This displays only the authors posts in the lists of posts to be edited.

Related links:

http://wordpress.org/support/topic/manage-your-posts-only?replies=3