A new free-access database of constant-wavelength powder diffraction patterns, PowBase, is searchable online at : http://sdpd.univ-lemans.fr/powbase/ The current content is already 81 patterns (conventional X-ray, synchrotron, neutron) presenting typical cases for high or low resolution, line broadening effects, standard materials, ab initio structure determination, etc. This is almost 3% of the future ICDD PDF-3 commercial database after 6 days of existence. Enlarging the base depends on you. Send your data, published or not, inorganic as well as organic ! Armel Le Bail http://www.cristal.org/ chemweb: A list for Chemical Applications of the Internet. To post to list: mailto:chemweb@ic.ac.uk Archived as: http://www.lists.ic.ac.uk/hypermail/chemweb/ To (un)subscribe, mailto:majordomo@ic.ac.uk the following message; (un)subscribe chemweb List coordinator, Henry Rzepa (mailto:rzepa@ic.ac.uk)