Configuration Manager with Jason Lewis
SCUP Catalogs Best Practices
Follow me on Twitter @JLewisMS
Minfang, a tester on our SCUP team, wrote this great blog article on how to troubleshoot applicability rules when writing your own software updates. Check it out here: http://blogs.msdn.com/b/minfangl/archive/2011/10/26/troubleshoot-detection-logic-issue-for-updates-created-by-system-center-update-publisher-2011.aspx