http://blogs.technet.com/beatrice/archive/2008/11/17/performance-monitor-sql-counters-and-tresholds.aspxWhilst surfing on the web last week, I've found this very nice blog from Vipul Shah, which happens to be a Microsoft colleague, which explains which are the key performance counters to monitor for your SQL Server instances and most importantly summarizesit-ITCommunityServer 2.1 SP1 (Build: 61025.2)