Always On is something I have been researching lately. Several new features are added including the ability to read from the secondary, backup from the secondary, grouping databases into a cohesive group for failover, etc.

As I was reading I came across a quick setup link that brings you through the steps of setting up Always On. This will be useful for first timers:

http://blogs.msdn.com/b/sqlserverfaq/archive/2010/12/17/sql-server-denali-alwayson-hadr-step-by-setup-setup-guide.aspx

And, here's another setup example that is a bit more detailed:

http://www.brentozar.com/archive/2011/07/how-set-up-sql-server-denali-availability-groups/