Despite google, finding the right link to information is not always easy. This page contains some links I have found useful
HazardEx runs conferences, newsletters and a journal that bring together mainly the electrical suppliers of equipment for explosive atmospheres.
The I Chem E publish lots of relevant books, including the main reference work on dust explosions
The official ATEX guidelines from the European Union are a fairly indigestible read, but they are authoritative and do get updated as questions are resolved in Brussels. The latest version was published in June 2009. A recent example of the sort of tricky issue they try to clarify, is the example of applying ATEX to silos, bins and filters
Kidde Graviner have almost certainly done more than any other European company to develop and market explosion suppression systems, and they have published much valuable research on controlling dust explosions over the years .
Prof Robert Shoeff and others at Kansas State University have been collecting and publishing statistics of dust explosions in the American agriculture sector for over 20 years. Its just a pity that they seem to have done little to cut the toll of death and damage.
Hartmut Beck, while working for the the Hauptverband der gerwerblichen Berufsgenossenschaften was equally diligent in collecting dust explosion statistics from German industry. This report from 1997 gives tables of results analysed in various useful ways