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Pete
That wasn't what I was thinking. but who knows it might work for surfaces.  Well for us, we don't bother with MATLAB for true 3D volume visualization.  It's just not made for such things, as compared to others that are, such as
avizo: http://www.tgs.com/products/avizo.asp
amira: http://www.amiravis.com/
volvis: http://www.cs.sunysb.edu/~vislab/volvis_home.html
volview: http://www.kitware.com/products/volview.html
With these you can really do powerful volume visualization including cut-away views, projections, segmentation, transparent rendering, threshold-based rendering, rotation (like you want), cropping, resizing, converting to other formats, distance and volume measurement, and so much more.

If you really want to use MATLAB instead of some of the superior packages, then Google has quite a few ideas ("volume visualization in MATLAB" was one of it's automatically generated hints/suggestions):
http://www.google.com/search?hl=en&q=volume+visualization+in+matlab&aq=5&oq=volume+vis

Regards,
ImageAnalyst