Overall this paper gives an excellent overview of the different techniques of volume rendering. While it is a good overview, some more implementation details would be nice. It would be nice to give the implementation details on one or two rendering methods in a similar way that "Marching cubes: A high resolution 3D surface construction algorithm" does. Presumably the referenced papers should provide more of these needed details, but a bit more in the overview would be nice.
It also does not really discuss in great detail the benefits or drawbacks of the different techniques, which would help in deciding which ones to use. An analysis of the difficulty in implementing the specific method and a performance comparison would be useful as well.
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