/**
 * ...
 *
 * // alternatively, with named binding
 * $select->where('id = :id');
 * 
 *
 * Note that it is more correct to use named bindings in your
 * queries for values other than strings. When you use named
 * bindings, don't forget to pass the values when actually
 * making a query:
 *
 * 
 * $db->fetchAll($select, array('id' => 5));
 * 
 * ...
 */

The docblock of Zend_Db_Select::where() is not valid anymore. Instead of this you have to use bind() method ...

$select->where('id = :id')
       ->bind(array(':id' => $id));
$select->fetchAll($select);