Internet surfer currently using a lot of Google Maps in tons of differs ways. Since the announcement of Google Maps has ease a lot of developer integrate their business and their idea on online mapping portal technology which a really funs and useful for people.
Here is some of links might be useful for you that i found on Cybernetnews.com about Usage of Google Maps:-

• Map My Run – Map your jogging path and calculate how many calories you have burned. You can place starting point, stopping points, and your finish point.
• ASCII Maps – Use Google Maps in ASCII mode! It might make your eyes bug out.
• Traceroute.V – Your IP address on a Google Map.
• Flood Maps – Watch for rising water.
• Census Information – Census information plotted for your local area.
• Wikimapia – WikiMapia is a project to help describe the whole planet Earth.
• UFO Sightings – Find out where there have been UFO Sightings.
• Where’s Tim Hibbard? – Track Tim’s location (location updated every 15 seconds).
• New York City Homicide Map – Pretty self-explanatory.
• Sex Offenders – Get a map of your local sex offenders.
• ZIP Code Boundaries – Map the boundaries for any ZIP Code.
• Toronto Highway Traffic Flow – Find out where the traffic jams are in Toronto.
• Package Tracker – A UPS, FedEx, USPS, or DHL/AirBorne package tracking service.
• World Of Warcraft Map – The World Of Warcraft on a Google Map!
• Meteor Impact Craters – Find meteors from around the world.
• Daylight Map – Find out where the sun is shining around the world.
• Top 100 U.S. High Schools – The top 100 high schools in the United States according to Newsweek.
• Weather Stations – Shows locations of weather stations and what weather they are reporting.
• New York City Subway System – Maps of the New York City subway system.
• Map Of Digg Users – A map of Digg users that has almost 8000 submissions.

Thks to Cybernetnews for sharing the usage of Google Maps web links