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This is a plugin that will block a spammer if he already has been tagged as a spammer. I use it together with the Akismet plugin. Akismet tags the spammer, and wp-denyhost prevents him from adding more comment spam.

Core functionality :

define('PS_DENYHOST_THRESHOLD', 5);
function ps_denyhost() {
    global $wpdb;

    $suspect = $this->get_IP();
    $count = (int) $wpdb->get_var("SELECT COUNT(comment_ID) FROM $wpdb->comments WHERE comment_approved = 'spam' AND comment_author_IP = '$suspect'");

    if ($count > PS_DENYHOST_THRESHOLD) {
        exit;
    }
}
add_action('init', 'ps_denyhost');

Download / install: http://wordpress.org/extend/plugins/wp-denyhost/

View-source: http://soderlind.no/code/view/ps_wp_denyhost.php

Changelog (updated 28.12.2009):