  Five contemporary technologies are discussed in the context of their
potential roles in particle tracking for future high energy physics
applications. These include sensors of the 3D configuration, in both diamond
and silicon, submicron-dimension pixels, thin film detectors, and scintillating
quantum dots in gallium arsenide. Drivers of the technologies include radiation
hardness, excellent position, vertex, and timing resolution, simplified
integration, and optimized power, cost, and material.
