The "Path Redirect" module for Drupal 6 (http://drupal.org/project/path_redirect) is an excellent way to set up redirects from one URL to another. This module can be used for any purpose where you want the HTTP request for URL's on a Drupal website to automatically redirect to another URL. For example :-

• you might want to have a nice URL to promote for some excellent product (example.com/excellent-camera) that lands on a merchant website while hiding the complexity of the merchant URL (making sure to include the affiliate link).