Meet Confluence, a wiki that any mid-level manager can feel safe using (by way of Blahsploitation).
Confluence, the professional J2EE wiki, is a knowledge management tool designed to make it easy for a team to share information with each other, and with the world. Source
Professional knowledge management! It had better be, because Atlassian charges $2,000 for unlimited users. But the company does deserve kudos for offering a license for use of this product in open source software (on a case-by-case basis).