Montgomery County's Department of Public Safety publishes emergency incidents online in several formats including a Google Map mashup.

The Montgomery County Department of Public Safety is using its Web site to post up-to-the-minute details of dispatched emergency calls, like fire, EMS and traffic incidents, garnering some attention from national government tech glossy Government Technology.
Along with a map of incidents (pictured), an RSS feed of activity, and a live audio feed of the department’s EMS and fire scanners, the department even offers a mobile version of the incident list.
According to department officials, the site was developed to reduce incoming calls from media inquiring about incidents. The site has “dramatically reduced” the number of calls, the publication reports, from 50 to 100 calls to sometimes two calls per day. The site gets 60,000 hits per month, officials say.
News to us is that Philadelphia’s police, fire and EMS audio feeds are also available online.