Translation in Wikimedia Projects
Some very interesting slides from Wikimania 2008 (argh, wish I had gone):
Image:Translation in Wikimedia Projects - Arria.pdf - Wikimedia Commons
(Click the document image to see the pdf.)
Lots of thought-provoking statistics in there. One that caught my eye particularly was that a majority of the interviewed translators on Wikimedia projects don’t translate at work.
Still, the numbers I myself have always wondered about are not revealed. Admittedly, it would be very hard to answer. Namely: what percentage of the text on the various Wikipedias is translated from another Wikipedia?
Also, some interesting reactions to the survey here: All The Modern Things: Translation in Wikimedia Projects

Video:
http://www.bibalex.org/isis/Frontend/archive/Archive_Movie.aspx (page 6 - it will be about 200-300mb)
or
http://www.kaltura.com/devwiki/index.php/Translation_in_Wikimedia_Projects
Are you on the Open Translation Tools mailing list? If not, you might find it interesting.
Translators not working as translators:
and volunteers better quality than paid subjects.