Gerard asks:
Does any of these communities have *daily updates* of its localisations in some 300 languages to its production environment? If so can you give references?
You can go to http://git-scm.com/ and see git projects for:
Linux Kernel Perl Eclipse KDE Ruby on Rails Android PostgreSQL Debian
Click on the links and see how long a directory has been idle, see a log of changes, and a nice summary of changes and by whom. For example, on the Android platform/SDK, you can click on http://android.git.kernel.org/?p=platform/sdk.git;a=summary and see all of the changes made in the last 24 hours. Clicking on http://android.git.kernel.org/?p=platform/sdk.git;a=log gives a detail listing of changes. Clicking further, you see the author and the reviewer who merged the original back into the production.
I haven't used git yet but after reading the excellent article that Rob Lanphier posted (http://hginit.com/00.html), I think I will. That article also explains why there wouldn't have to be as many updates to SVN as is done today.
I don't think there's any doubt that git would work for Wikimedia but there would definitely be some workflow changes. That's probably the larger issue.
Mark W.