Disinfopedia
From the Quicksilver Metaweb.
Disinfopedia has changed names. It is now SourceWatch - http://www.sourcewatch.org/
If you hate liars, you'll like Disinfopedia.
An "encyclopedia of propaganda" using the MediaWiki software, it has full dossiers and bios on issues and organizations and people that are lied about, or used to lie through or around. It has also a relatively complete set of definitions of important terms like "standard of evidence", "point of view", etc., and is entirely GFDL so any of its text can be copied here.
It will probably eventually stress source attribution capabilities of a wikitext standard.