So I don't lose this, I wanted to post this. To filter the default hidden meta boxes, use this code in functions.php:
[php]add_filter('default_hidden_meta_boxes', 'be_hidden_meta_boxes', 2);
function be_hidden_meta_boxes($hidden, $screen) {
if ( 'post' == $screen->base || 'page' == $screen->base )
$hidden = array('slugdiv', 'trackbacksdiv', 'postexcerpt', 'commentstatusdiv', 'commentsdiv', 'authordiv', 'revisionsdiv');
// removed 'postcustom',
return $hidden;
}[/php]