In response to my login to edit post, Ted Ernst comments:
Great post! John just installed the Dynamic Page List extension (http://meta.wikimedia.org/wiki/DynamicPageList2) so now you can do whatever queries you like at WikiIndex. See http://www.wikiindex.com/DPL_Test_Page for more.
Ooh goody, lots of fun to be had with this, I think. The open source mediawiki developers are certainly delivering some innovative and powerful extensions, and the Wikiindex community is well positioned to make use of them.

Andy Roberts is a writer who initiated DARnet. Contact me on aroberts@gmail.com or @aroberts on twitter