My studio, Tencent Boston, is on 2009 and we're making an MMO so I doubt we'll be updating anytime soon. A couple of us have 2010 but mainly for the re-topo tools, which now that there's 3DCoat and a re-topo script that works in 2009 basically means we only use 2009 as our primary 3D application. Thanks! B
2011 at work, but we plan to switch to 2012 by the end of the summer, we're on subscription so its not a big deal. We are waiting for the current project to wind down and for 3rd party developers to update their plug-ins and scripts and for Autodesk to release SP1. At home I'm using 2012 for most things…