I'm working with SCCM and needed to troubleshoot some client items with task sequences.

Enabling Debug and Verbose Logging

To enable debug logging after installation, create the following registry key:
HKLM\SOFTWARE\Microsoft\CCM\Logging\debuglogging

To enable verbose logging after installation, change the following value to 0.  You will need to right click on the @Global key and change permissions to allow the current user to change the data in the key.
HKLM\Software\Microsoft\CCM\Logging\@Global\Loglevel

64 bit boxes
----------------
HKLM\Software\Wow6432Node\Microsoft\CCM .

32 bit boxes
----------------
HKLM\Software\Microsoft\CCM

Reference links

• http://www.myitforum.com/forums/tm.aspx?high=&m=204035&mpage=1#204035
• http://blogs.msdn.com/b/gabeb/archive/2008/08/06/enabling-debug-and-verbose-logging-in-configmgr-2007.aspx
• http://technet.microsoft.com/en-us/library/bb892800.aspx (complete list of log files)
• http://blogs.msdn.com/b/steverac/archive/2009/11/06/sccm-forcing-a-task-sequence-to-rerun.aspx (good stuff!)