A modern corporate workspace, consisting of matrix of cubicles on a large floor, does not provide isolation from noise from other employees. Noise becomes a distraction when loud sound reaches a person who is working in a cubicle. "Do not disturb" (DND) is a sensor networking application designed to address distracting noise in a corporate workspace. The system alerts people who are talking loud and may be causing distraction to co-workers in neighboring cubicles. DND is an example application for which we designed and built technologies to leverage processing heterogeneity in a sensor network.