I'm running Maya 2009 on Snow Leopard and it works OK apart from shader problems, and not being able to generate playblasts properly with the new QuickTime. I'm not complaining about these problems, as Autodesk has said that they don't yet support Snow Leopard (neither Maya 2009 nor 2010). But even under Leopard, Maya 2009 didn't run all that well. There were problems with the Animation Editors, despite my hardware being qualified. Realistically, when do you think there will be a version which runs well on Snow Leopard?