I will learn how to properly use

* "CCK":http://drupal.org/project/cck
* "Views":http://drupal.org/project/Views
* "Organic Groups":http://drupal.org/project/og

on Drupal 5. The CMS is moving at such a pace that I can't keep up. And these are the 3 most important and powerful modules I have not got around to master.