<?php

$wQuery = new WP_Query(
	array('post_type' => 'post',
		  'posts_per_page' => $how_many,
		  'cat' => '46,43', // categories should be supplied this way (an array doesn't work)
		  'meta_key' => 'post_views' ,
		  'orderby' => 'meta_value_num', // or meta_value (if it's a string)
		  'order' => 'DESC')
);




?>