So you haven't had a chance to play with the Standby Continuous Replication feature introduced with Exchange 2007 SP1 yet?
You want to get started in a few minutes? Then checkout this virtual lab.
Exchange Server 2007 includes a new feature in Service Pack 1 called Standby Continuous Replication, or SCR. SCR makes it easy to add high availability and disaster recovery capabilities to your e-mail environment. In this Virtual lab, you will learn to create SCR in Exchange Server 2007, and use SCR to recover from failure.