Recommended article on Exchange 2010 Disaster Recovery

This article was recommended to us by the instructor at the Exchange 2010 class I took recently....

"To demonstrate the scalability of the DAG feature, I will use only two servers in my example – one in the production site and one in the Disaster Recovery site. This represents the smallest installation that can be done for DAG, but remember this is a flexible solution so at any point if you need to scale out with multiple DAG members the steps you would perform are nearly identical."

from  http://anewmessagehasarrived.blogspot.com/2010/02/exchange-2010-site-disaster-recovery-on.html