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As well as the information on the DiBEG site, this book by Borko Furht and Syed A Ahson covers ISDB-T, although it is more about mobile broadcasting generally.
Japan has adopted ISDB-TSB for digital sound broadcasting, which is part of the ISDB set of standards. Argentina and Brasil have also adopted ISDB-T for television, but it is not yet known if they intend to use the system for digital radio also.
The digital radio broadcasts taking place currently are officially classified as test transmission, which are due to end in July 2011. When full-scale broadcasts begin, they will use new frequencies, and most likely new receivers will be required. It is expected that receivers for the current broadcasts will stop being available before that date.
Further information about ISDB-TSB is available from the site of DiBEG, the Digital Broadcast Experts Group. There is also information on the website of the Digital Radio Promotion Association
Eight OFDM blocks are broadcast. Broadcasters will be divided into groups who will develop their own services. In Tokyo there will be five one-segment groups and one three-segment group.
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