I gave a very good talk on MERGE that you can download here: http://sqlsaturday.com/217/schedule.aspx
Note you can View All Events and open the schedule page for every SQL Saturday that has ever happened. Anything you see of interest is freely available content. It is some of the best free learning on the web about SQL Server!!
Kevin G. Boles
SQL Server Consultant
SQL MVP 2007-2012
TheSQLGuru on googles mail service