Do you currently monitor the activity of IIS with Performance Monitor? No? You should start to as you can gather really interesting information about IIS and ASP (see article at 15 Seconds)! Though Performance Monitor is really cool, it has one disadvantage - it is quite hard to get readings of the performance counters across the Net.
This is where the AspQPerfCounters component is stepping in by providing an easy interface for retrieving performance counters. It is implemented as Automation component, not using ASP intrinsic objects, therefore allowing you to use it in any application (Excel sample is included). Note that it works only on Windows NT, however, one nice feature is that if you have a standard setup, it also works under the IUSR account - no special security permissions are needed.