NPL: Sensors & Functional Materials Group - Pu
the UK's national standards laboratory, who look after the basic units of measurement such as time, mass and length which ensure consistency and traceability of measurements.
Smart Material, Corp. (Germany)
Advanced piezoelectric Materials and Components
The Crystal Consortium Ltd.
conducts research into optoelectronics, piezoelectrics, and scintillators.
Theory and Applications of Piezo Ceramic Actuators
Physikinstrumente (Germany) - very good information about piezo actuators and positioning systems.