Everyone, the fantastic team at SQLskills is putting together online courses at Pluralsight, andthe first three courses are free for the next 30 days. These folks are the best, and I know these courses are going to be worth paying for.
SQL Server: Performance Tuning Using Wait Statistics (by Paul Randal)
SQL Server: Transact-SQL Basic Data Retrieval (by Joe Sack)
SQL Server: Collecting and Analyzing Trace Data (by Jonathan Kehayias)