Interim fn for Wordpress has_term(), that will come with WP 3.1

intermin_has_term.php

<?php
/***************************************************
 * DISCONTINUED - PLEASE UPDATE TO WORDPRESS v 3.1
 ***************************************************/
	/**
	 * post_has_term()
	 * must be used inside the loop
	 * not tested with arrays so far
	 * until WP 3.1
	 * @param	$tax	auto lowercase for slug
	 * @param	$term	auto lowercase for slug
	 * @return	bool	if one term was found
	 */
	if ( !function_exists('has_term') ) {
	function post_has_term( $tax = '', $term = '' ) {
		$terms = get_the_terms( $post->ID, $tax, '' );
		// Array
		if ( is_array($term) ) {
			foreach ($term as $searched) {
				foreach ($terms as $t) {
					$bool_arr[] .= ( $t->slug == strtolower($searched) ) ? true : false;
				}
			}
			return in_array('true', $bool_arr) ? true : false;
		}
		// no Array
		else {
			foreach ($terms as $t) {
				return $has_term = ( $t->slug == strtolower($term) ) ? true : false;
			}
		}
	}
	}
	elseif ( current_user_can('administrator') ) {
		wp_die( __('Upgrade Notice', 'text_domain'), __('You should go and replace your post_has_term()-function with the now avaible has_term() function from WP-Core.', 'text_domain') );
	}
?>