Progress on the Distributed Sensor Networks program is reported. Further design and analysis of strawman sensor and report circuit communications for a low-flying aircraft DSN are presented. System studies dealing with sensor redundancy, adaptive communications nonuniform node distribution, and alternative DSN applications are summarized. Overall designs for DSN node software, for a software development DSN simulation test bed, and acoustic node front-end simulation software are reviewed. Progress on development of a digital acoustic data collection system is reported.