I just saw this video from 'The Hobbit Blog' about how they have used 3D when filming the film. I am not normally a 3D fan, i cant think of anything worse than having to wear 3D glasses over my glasses...BUT... this video is really interesting and has made me change my opionion a little!
Take a look at the bit towards the end especially about drawing John Howe and Alan Lee drawing concept art in 3D for Peter Jackson! its really interesting to think how you might change your visualisation style to suit the 3D camera!