The blog post Top Knowledge Articles documents describes the goal of these documents on Communities - to make knowledge frequently used by Customer Support easily accessible to community members.
You can find a list of all such documents by using this query on communities.
Below is a list of these documents grouped by product area, which may make it easier to find ones of interest.
Control-M or Workload Automation
IT Service Management / Remedy
Top 10 Knowledge Articles for Service Request Management - (included in Support notes)
Performance and Availability / ProactiveNet / TrueSight
BladeLogic, Data Center Automation, and Cloud Lifecycle Management