MapEcos is a Google Maps mashup that "presents a balanced view of industrial environmental performance." It mashes up with the Toxic Release Inventory (TRI) dataset from the EPA and then displays the information logically on a map so an average person can understand what the factory down the street is spewing into the air. MapEcos was developed by students at Dartmouth College along with faculty of the business schools at Dartmouth, Duke, and Harvard. This is a fantastic UI that has some really nice clustering, search and zoom features to work with a very large dataset. This is a great mashup.
Over 300 Great Lakes webcams (US & Canada) .. mapped!
This awesome webcam mashup is courtesy of AJ Hartley at Michigan/Canadian weather mashup PleasantWeather.com..
CrimeReportsLive.com: Crime Reports in Dallas
Kenneth "Ellis" McCall has created a well presented crime map for Dallas, Texas. It welcomes you with a great options to learn about the free and premium service and also offers a mobile mapping service. (News coverage for this mashup)
- US National Golf Map - An extensive Google Maps mashup of courses for every state!
- NCAA Football: College Bowl Schedule Mashup - Sorts the games by Date, Teams Traveling most miles and Teams Traveling least miles (Brent Evans has also created a mashup for this.. found here)
- Saving Yellowstone: Map of the President Arthur Expedition - This "bookmap" shows the route that is chronicled in the book: Saving Yellowstone: The President Arthur Expedition of 1883
- Dog Park USA Map - Greg Holsclaw and his wife have created a massive state dog park mashup that includes a nifty "Export this map" feature, allowing you to embed the map into your own blog/website.
- TrailHeadFinder - Hiking trail map for US and Canada
- California Medical Marijuana Locator: Southern and Northern California