We are pleased to announce the BioSync Web resource at http://biosync.sdsc.edu. Developed on behalf of the Structural Biology Synchrotron Users Organization (BioSync), this resource serves as a structural biologist's guide to synchrotron facilities. The BioSync organization has collaborated with the San Diego Supercomputer Center to create a comprehensive synchrotron portal and informational web site using modern information practices. Users of the web site can investigate the different technical capabilities of each beamline and find out logistical information such as scheduling and travel arrangements. Synchrotron personnel update the web site regularly to provide current information to the user community and to help guide projects to the appropriate facility. In addition, BioSync is working with the Protein Data Bank (PDB; http://www.rcsb.org/pdb) to automatically include beamline specific information with structure depositions. The BioSync web resource strives to provide timely, accurate, and complete information on synchrotron resources to the community of structural biologists. This resource is a part of the National Biomedical Computation Resource, an NIH National Center for Research Resources hosted at the San Diego Supercomputer Center.