wiki

How to Edit Any Web Page in your Browser

Use Microsoft Word as a WYSIWYG Editor for Wikis

Google Sites – Create Wiki style Websites

Compare Changes on a Web Page Side-by-side Like a Wiki

Google Help Center taking shape of a Wiki with help from Knol

A Portable Wiki for your USB Drive

Edit Google Maps Like a Wiki; Add Roads, Schools, Buildings, etc.

Quickly Grab a URL on Google Wikis; No Google Juice Though

How to Add Google Sites to an Existing Google Apps Account ?