Richard and Greg dig deep into PerfMon with Shane Creamer. Shane works with Microsoft Premier Field Engineering and runs the Vital Signs workshop, a three day course teaching everything the administrator needs to know about performance monitor. Download the video Here. Also, a link to the 25 key perfmon counters is in Stephen Choy's article at http://technet.microsoft.com/en-us/magazine/cc718984.aspx?pr=blog.