Path

The path module lets you create custom urls for your Drupal paths.
For example, assume you want to post your resume for potential
employers. Without the paths module enabled, the URL to view your
resume would be something like yourdomain.com/node/view/26. Using
this module, you could create a new URL to your resume such as
yourdomain.com/my/resume or yourdomain.com/resume.html.

As of Drupal 4.3, this module has been integrated into the core. If you would like to keep your old aliases during the upgrade, download this script and run it against your 4.2 database to generate the necessary sql statements for the new drupal installation.