Editors: Matthias Weidemüller is head of the Laser Cooling Group at the Max-Planck-Institute for Nuclear Physics and Lecturer of Physics at the University of Heidelberg. After studying Physics in Bonn, Munich and Paris he attained his doctorate in 1995 at the Max-Planck-Institute for Quantum Optics. He spent two years as a Postdoc at the University of Amsterdam and the FOM-Institute for Atomic and Molecular Physics, before entering the Max-Planck-Institute for Nuclear Physics in Heidelberg. His group experimentally explores the physics of ultracold atomic and molecular gases in very different environments ranging from tiny optical traps to large-scale heavy-ion storage rings. Claus Zimmermann is Professor for Experimental Physics at the University of Tübingen in Germany. In 1990 he attained his doctorate at the Max-Planck Institut for Quantum Optics in Munich in the research group of Prof. T. Hänsch. He was appointed full Professor at the University of Tübingen in 1998. His scientific activities range from laser development, non-linear optics and precision spectroscopy to optical cooling and ultra cold quantum gases. Authors: Peter van der Straten, Universiy of Utrecht, The Netherlands John Weiner, Universiy Paul Sabatier, Toulouse, France Allard Mosk, FOM, Rijnhuizen, The Netherlands Klaus Sengstock, University of Hamburg, Germany Eberhard Tiemann, University of Hannover, Germany Rudi Grimm, University of Innsbruck, Austria Phil Gould, University of Connecticut, USA Giovanni Modugno, LENS, Florence, Italy Daniel Comparat, Laboratory Aimé Cotton, Orsay, France Daniel Zajfman, Weizmann Institute, Rehovot, Israel Immanuel Bloch, University of Munich, Germany Neill Claussen, JILA, Boulder, USA Ben Sauer, SCOAP, Brighton, UK Gerard Meijer, FOM Rijnhuizen, The Netherlands