Microsoft Windows Update - Tips and techniques
Some excellent Windows Update tips and techniques recently published
Servicing related questions I have seen this week - Ramblings of a Support Engineer
http://blogs.technet.com/b/joscon/archive/2011/01/26/servicing-related-questions-i-have-seen-this-week.aspx
This is a very useful table of Windows Update result codes noted in the above link:
Appendix G: Windows Update Agent Result Codes
http://technet.microsoft.com/en-us/library/cc720442%28WS.10%29.aspx