Great teaser video from OConnor about their new Mattebox System that can have handles attached directly to the side of it. A few other manufactures are going down this path of a new style Mattebox. Should be a great time on the floor at NAB 2011.
https://www.ocon.com/products/camera-accessories/o-box.html
The OConnor O-Box WM is a two-stage mattebox designed around the 16:9 format full-size sensor. A wide-angle system, it accommodates lenses up to 18mm (and in some cases wider).