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Build a load balanced, high availability, shared-nothing web cluster for under $60/month using two Linode VPSes with rsync, MySQL replication, and SSH tunnels.

Customise Web Invoice email templates for invoice, reminder, and receipt using built-in variables, and add your own via a plugin filter for full localisation.

Facebook went read-only for about 10 minutes, blocking status updates and comments with a database write failed message — a brief but frustrating outage in 2009.