I see two sites on google which you may be interested in pursing: One from the BioCycle Magazine ( listed below) and the other from earhworm digest- mid and large scale worm composting. From BioCycle Magazine November 2000, Page 51 COMMERCIAL SYSTEMS LATEST DEVELOPMENTS IN MID-TO-LARGE-SCALE VERMICOMPOSTING This overview of systems and operational projects describes factors which contribute to their success as well as the challenges that have forced sites to close. Rhonda Sherman-Huntoon