When you create a new Drupal installation two users are created. The first is the obvious admin user with uid 1, which you will use to create your first pieces of content (or, for larger sites, to create the moderation role, assign the necessary permissions and create the moderation users). The second user might be less obvious. It's the virtual anonymous user with uid 0. You will not find it in any user listing, you can not assign any roles to it and you can not log in as the anonymous user. It's important to realize that both users are essential.

Earlier this year I wrote a small guide on what to do when you're experiencing character encoding issues after upgrading MySQL to version 4.1 or higher. Now after a large combined effort with JirkaRybka a documentation page is set up in the Troubleshooting FAQ: MySQL 4.0 -> 4.1 migration.

This guide includes background information, a description of several issues when upgrading MySQL and a solution for each problem. You no longer need to manually change update.php (cfr. my earlier guide) since a stand-alone script was written that works for Drupal 4.7, Drupal 5 and Drupal 6! This is very important since Drupal 6 will require you to have MySQL 4.1 or up, if you're using MySQL of course, and this will make upgrading so much easier, saving people a lot of precious time debugging. This documentation and the script are all a combined effort of JirkaRybka, Heine, Acert93 and myself.

You can check the original request by Acert93 to provide more information on this issue and see how this documentation came to be.