There's plenty written about database mirroring already, a cool new feature of SQL which enables you to create a hot standby (read: automatic failover) for a database on your server (read: NOT the whole server)...
One tip: If you are mirroring across any significant distance, and require synchronous mirroring, take lag time into account, as you will nto commit for the 30-90 ms round-trip time it takes to push the change out to the target server.
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