Url alter | drupal.org

Utility module that adds new hook_url_alter() hooks for other modules to implement. Also replaces the need for custom_url_rewrite() functions in settings.php. This is a backport implementation of the proposed Drupal 7 patch #320331: Turn custom_url_rewrite_inbound and custom_url_rewrite_outbound into hooks.

If you use any of the following modules, it is highly recommended that you install this module:
FeedBurner
Subdomain
Domain Access
Context Prefix (part of the Context module)
Bandwidth