I'm working on some perfmon issues related to sql server.  Here are a few links with articles covering which perfmon counters and values should be used.  If you are in a position where you have to troubleshoot these types of things, this is a must read.  A fellow co-worker passed along the first two, which are really good.

• http://www.sql-server-performance.com/sql_server_performance_audit5.asp
• http://www.sqljunkies.com/Article/D1B7C756-4725-4D31-A53D-C0A47976E6BB.scuk
• http://www.sql-server-performance.com/performance_monitor_counters_io.asp
• http://www.sql-server-performance.com/sql_server_performance_audit2.asp