I receive the Sitepoint newsletter, along with several thousand other
people. One of their featured articles is this:
What
is a Wiki?
By Nathan
Matias
If this is a question you've asked yourself, you're not alone! Nate
clears up the confusion with this in-depth look at the wiki. Starting at
the very beginning, he explores wiki history, functionality, software,
and more.
It includes several links to the English Wikipedia (including one
to JTDirl's contribution list!).
--Catherine