Find a Musical Instrument Retailer in your area - Here is a great Google Maps mashup intended to promote music and help local music instrument retailers in the U.S. It has been established by the Musical Merchandise Review.
USA Track & Field: Hundreds of Jogging Routes - USATF.org has used the Google Maps API to create a catalog of hundreds of running routes for across the U.S. - Search the database or add your own route. Here is an example using New York's Central Park "Full Loop" (I'm sure New Yorkers are too tired to run after the strike!)
North American Pow Wows - A Google Map of upcoming Pow Wows across the U.S. and Canada. There are impressive search filtering options on this map. (Wikipedia: Pow Wow)
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