Download Multi-plugin

Installation is as simple as renaming the file to .php, uploading it to your server, activating it, and adding some script to the textbox (for example, I use the following code to remove the nofollow attribute from comments.)

<?php
add_filter('get_comment_author_link', 'aoi_follow');
add_filter('comment_text', 'aoi_follow');
function aoi_follow($link){
   return preg_replace('/(<a.*?rel[^>]*)nofollow(.*?)/','${1}${2}',$link);
}

?>

You can also use the following to add the trailing slash back onto feeds, categories, pages, etc. in WordPress 2.2+.

<?php
add_filter('user_trailingslashit', 'aoi_slashit',10,2);
function aoi_slashit($string, $type=''){
  if($type == 'page' || $type == 'category'|| $type == 'month'|| $type == 'day'|| $type == 'paged'|| $type == 'feed'){
    return trailingslashit($string);
  }else{
   return $string;
  }
}
?>