Microsoft has a launched a SharePointPedia, where you will find information and links to content recommended by the SharePoint community. Read more about it on the SharePoint team blog "Announcing SharePointPedia -- community driven content recommendations and requests!"
From the SharePointPedia team:
It’s a social computing application built on top of Microsoft Office SharePoint Server (MOSS) 2007. Anyone with a Windows Live ID may become a registered user and can then submit content recommendations or requests, leave comments, or just vouch for whatever they like.
Note that SharePointPedia is not a wiki. It’s a “pedia” in the sense of being a compendium of useful content, but rather than being limited by just wiki functionality, it leverages the much broader set of capabilities in SharePoint. SharePointPedia is also about community, where you can find and connect with others, who have similar interests as you or who have recommended content relevant to you. We hope that you will find SharePointPedia useful, and we would greatly appreciate your feedback to make it even better.
What are you waiting for, check out SharePointPedia (sharepointpedia.com)