This sounds like something that should go to the The Loop – you want this class per post, not for the whole <body>, right? Roughly archive.php (or index.php, or category-*.php) should look like this:
while (have_posts()) {
the_post();
$add_class = array();
if (in_category('new')) { // inside the loop, don't need $post->ID
$add_class[] = 'new';
if (in_category('featured'))
$add_class[] = 'featured'; // and so on
?>
<article <?php post_class($add_class); ?>>
<?php // ...
}
Or, depending on the theme, in content.php or some version thereof.
See docs for post_class.
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