There are 5 (five) videos available at www.msexchangeteam.com demonstrating the SCR feature that will be available in the SP1 of Exchange Server 2007.
Beta 2 of Service Pack 1 Exchange Server 2007 is available for public download and preview for MSDN and TechNet subscribers. As I wrote in my blog entry, Standby Continuous Replication in Exchange Server 2007 Service Pack 1, SCR extends the continuous replication technology in Exchange 2007, enabling new data availability scenarios for Exchange 2007 Mailbox servers. You can find product documentation for SCR in the recently refreshed TechCenter update at http://technet.microsoft.com/en-us/library/bb676502.aspx.
To demonstrate one of those scenarios, I have created a 5-part blogcast that takes you through the process of enabling SCR, monitoring SCR, and activating an SCR storage group copy using the Exchange Management Shell and other features, such as database portability. This scenario is based on the scenario detailed in the Help topic Standby Continuous Replication: Database Portability.
Read more at source: http://msexchangeteam.com/archive/2007/09/13/447006.aspx