Here is a new mashup called Seattle911.com that displays the most recent 911 fire calls which have been placed in that city. The call type indicates what level of emergency it is and the pins on the Google map tell you what part of the city units have been dispatched to. Seattle911 is a mashup between publicly accessible data from Seattle.gov and Google Maps, using the Google Maps API.
There are other related Google Maps mashups tracking police calls and crimes in other US cities found here.
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