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High Availability – Always On Technologies
Microsoft SQL Server 2008 Always On Technologies provides a full range of options to minimize downtime and maintain appropriate levels of application availability.   

Increased Availability
Minimize downtime, speed recovery, and achieve the appropriate level of availability defined by service level agreements.

Decreased Downtime
Recover quickly from unplanned downtime and minimize downtime from system maintenance and operational procedures that are necessary for smooth operation of mission critical applications.

Improved Manageability
Investigate, monitor, and recover damaged data across your enterprise using powerful, productive management tools that simplify recovery.  
 
Top new features
· Recover corrupt data pages from a mirror server with enhanced Database Mirroring features
· Take advantages of Failover Clustering enhancements in Windows Server® 2008
· Add new nodes to a peer-to-peer replication solution without taking replication offline
· Improve restore times and reduce backup volumes with new support for backup compression
· Improve concurrency with locking enhancements
· Reduce downtime for hardware maintenance with hot-add CPU capabilities
· Use Resource Governor to proactively control workload prioritization