Proven SQL Server Architectures for High Availability and Disaster Recovery
Thanks to Paul S. Randal for sharing the information!

This new whitepaper describes the five most commonly deployed high-availability and disaster-recovery architectures deployed by customers, along with a case study of each.

It covers:

• Failover Clustering for High Availability with Database Mirroring for Disaster Recovery
• Database Mirroring for High Availability and Disaster Recovery
• Geo-Clustering for High Availability and Disaster Recovery
• Failover Clustering for High Availability Combined with SAN-Based Replication for Disaster Recovery
• Peer-to-Peer Replication for High Availability and Disaster Recovery

You can get it from this link.