Another interesting read from the Microsoft IT team, on how they have implemented the new Failover Clustering in WS2008 to ensure high availability, in this case, of File Services.
"Microsoft Information Technology (Microsoft IT) uses failover clustering in the Windows Server 2008 operating system to support users worldwide. Microsoft IT found the solution easy to plan and deploy, especially because of built-in migration tools. The result is a set of Windows Server 2008 clusters that support more users through increased reliability and features"
The article goes on to discuss the situation, the solution, and best of all, the reasoning behind choosing WS2008 Failover Clustering to provide the solution. The article also goes into detail about how they achieved the solution, discussing such elements as migration, storage signatures and active/passive pairing.
You can read it all here: http://technet.microsoft.com/en-us/library/cc500982.aspx