I noticed the EventLog error below on two new Windows 2008 R2 servers recently deployed.  Also I saw the memory utilization was quite high on a server that has not been rolled out yet.  The WMIPRVSE.EXE was using > 350 megs of memory.  

A little research led me to a Microsoft Hotfix.  Hotfix installed, servers restarted, and memory seems much improved.  Will monitor for the apphang, but looks good thus far.

KB Article - The "Win32_Service" WMI class leaks memory in Windows Server 2008 R2 and in Windows 7

URL - http://support.microsoft.com/kb/981314

Event Log Entry

Log Name:      Application
Source:        Application Error
Date:          9/20/2010 8:43:41 PM
Event ID:      1000
Task Category: (100)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      
Description:
Faulting application name: wmiprvse.exe, version: 6.1.7600.16385, time stamp: 0x4a5bc794
Faulting module name: ole32.dll, version: 6.1.7600.16385, time stamp: 0x4a5be01a
Exception code: 0xc0000005
Faulting application name: wmiprvse.exe, version: 6.1.7600.16385, time stamp: 0x4a5bc794
Faulting module name: ole32.dll, version: 6.1.7600.16385, time stamp: 0x4a5be01a
Exception code: 0xc0000005
Fault offset: 0x00000000000204e4
Faulting process id: 0xb10
Faulting application start time: 0x01cb57b661b70187
Faulting application path: C:\Windows\system32\wbem\wmiprvse.exe
Faulting module path: C:\Windows\system32\ole32.dll
Report Id: 475ff9b1-c519-11df-aa64-005056ac4510Fault offset: 0x00000000000204e4