WordPress.org

Attention: This plugin it only can be used and activated by the 'blog owner' or any user with level 10.

1. Open the file wp-config.php set DB_CHARSET to utf8 and leave DB_COLLATE with nothing. (Just for WordPress 2.2.x)
2. Upload UTF8_DB_Converter.php to the /wp-content/plugins/ directory.
3. Activate the plugin through the 'Plugins' menu in WordPress.
4. Go to the sub menu called 'UTF-8 Database Converter'.
5. And just follow the instructions on the screen.