Heap Counters For Windows Perfmon

I came across this article today about adding HEAP counters in Perfmon by turning on a registry key:

http://support.microsoft.com/?kbid=290639

The heap performance-monitoring counter is a new feature in Microsoft Windows XP. This feature is included in Microsoft Windows Server 2003, Windows Vista, and Windows Server 2008. Performance Logs and Alerts (Perfmon.exe) can display about 20 heap-related counters. These counters are not enabled by default; you must enable them.
See the article for a complete listing of the counters it adds and the registry key changing information.