The handbook Table of Isotopes has for many years been the most widely used source of information for nuclear structure and decay data. Please refer to this link for information about the book, the CD-ROM and also additional tables and information on nuclear data. This service is intended to give convenient Web access to the Table of Isotopes data. At present only part of the decay data is implemented, but the service will eventually include search facilities, table generators, charts and drawings of all nuclear structure and decay data in the ToI book.