By now anyone running a MySQL server for something bigger then a brochure website will know that replication can afford them the ability to do some wonderful things. It's no silver bullet on it's own though. There's much to know about stock MySQL replication, from installation to security to troubleshooting it when it's not behaving itself.
MySQL Team Technical Lead, Pythian
Ben currently works as a MySQL DBA at The Pythian Group, previous to this he was a DBA at Nokia, where he provided MySQL support for Mobile Services such as Music, Maps, and Messaging.