There is the openstreetmaps project, using xml .osm format:

"A new version of planet.osm is released weekly (currently every Thursday morning). We have these, going back to the start of April 2006. The current size of a planet.osm file is over 171 Gigabytes.(reduced to 11GB with bzip2 compression) as of September 2010."

from: "http://wiki.openstreetmap.org/wiki/Planet.osm"

There is also WikiHow, http://en.wikipedia.org/wiki/WikiHow

They license their content with Creative Commons, yet they don't provide public dumps of the site.  I have asked them to about this in the past on their forum with no luck so far.



----- Original Message -----
From: emijrp <emijrp@gmail.com>
Date: Tuesday, October 12, 2010 6:47 am
Subject: [Xmldatadumps-l] Public dumps
To: xmldatadumps-l@lists.wikimedia.org

> Hi;
> Do you know more projects which publish public dumps? I know
> Wikimedia,Wikia and Citizendium. Any more? I'm working in a tool
> for analysing dumps,
> and I want to add support to all of them.
> Thanks,
> emijrp