This is one of the guidelines in wikinomics.

In Wikinomics, in lieu of having a customizable menu, we are using the tagging function mainly to assist internal navigation.

By Wikinomics Chapter - Pages should first be tagged to the chapter in Wikinomics Table of Contents that the topic applies to. Applying more than one is ok.

By Page Type - Special types of pages, like a chapter hub, help page, user page, talk page, guidelines should be tagged that way.

Tags should be self-referencing.

Examples:
The chapter hub Peer Pioneers should be tagged "Peer Pioneers" and "chapter hub"