Two years after the last conference in this series, x-ray tomography continues to develop in interesting directions. Tomography studies with highly brilliant and collimated synchrotron radiation are now expected to have significant quantitative theoretical and/or experimental components. The understanding and application of various contrast mechanisms has advanced, particularly as pertains to complex specimens in three dimensions. Scanners using x-ray tubes are widely distributed and used for high-resolution studies. In medicine, sophisticated helical and multiple source scanners are in the public eye. Progress continues on increasing specimen sizes that can be investigated at a given resolution; and the speed, efficiency, and spatial resolution of x-ray detector systems have improved. The scope of engineering and scientific problems has increased. Contrast techniques such as scatter, phase, fluorescence, diffraction enhancement, dual-energy imaging and x-ray diffraction are evolving to yield more sensitivity to structural changes at less radiation burden to the specimen. Data acquisition rates have increased so much that storage and analysis are now major considerations. This conference's goal is to strengthen the interdisciplinary discussion of tomography. Scientists and engineers from different fields including medicine, biology, earth science, materials testing and development, crystallography, solid state physics, chemistry, micro-mechanics, and micro-devices are invited to present their results and to describe/learn different strategies and components for tomography as well as novel applications.