SQL Tuning

Great page of tutorials (powered by Quest)
http://sqlserverpedia.com/wiki/SQL_Server_Tutorials

Related Article

• What is Swapiness and How to Change it?
• End of support for Server 2003 and SQL 2005 – wow!
• SQL Training Podcasts and Videos

Also check out PAL
http://blogs.technet.com/b/mikelag/archive/2008/08/20/performance-troubleshooting-using-the-pal-tool.aspx