I’ve just upgraded this site and several others I oversee and help manage to WordPress 2.0.4, the latest version of the popular blogging software. Upgrading was very easy as you only need to upload the files and overwrite the existing ones in your server.
Unlike previous upgrades, however, you are not prompted with the database upgrade link after you finish uploading the files. You have to use the yourblogaddres/wp-admin/upgrade.php script. I don’t know if you need to run the script but I just did it for good measure. When I finished uploading the files, I noticed that the dashboard already indicated 2.0.4 as my WordPress version even if I did not run the upgrade script.
WordPress creator Matt Mullenweg said in the WordPress developer blog that the upgrade “contains several important security fixes, so it’s highly recommended for all users.” It also contains more than 50 bug fixes, for a listing click here.