I thought I share a few interesting links:
Gnome switches to git: http://mail.gnome.org/archives/desktop-devel-list/2009-March/msg00086.html

But not everybody does so, e.g. Python is switching right now to Mercurial: http://mail.python.org/pipermail/python-dev/2009-March/087931.html

Eric Sinc has an interesting blog about DVCSs: http://www.ericsink.com/

Ah, yes, Joel also mentions git ;-)
http://www.joelonsoftware.com/items/2009/03/09.html

Alex