I'm working on a list of testimonials of corporate users of MediaWiki. The first one, from Novell, can be seen at: http://www.mediawiki.org/wiki/Sites_using_MediaWiki/corporate
I've contacted most of the other companies in the list (I haven't found someone to talk to at AOL yet, which was listed as a MediaWiki user, hence I have removed it pending verification). I don't expect many responses, but if we get 3-4 testimonials in the end, I'll already be happy.
If your company uses MediaWiki, please send me a quick e-mail, or feel free to post a testimonial publicly. What I'm looking for are one paragraph summaries of how different companies are using the software, in addition to brief company profiles. Extensive case studies would also be cool, of course, if you're happy to put them under the GFDL.
Cheers,
Erik