Here's a neat example of how the Google Maps API doesn't always need to be used to display maps. Markus Dressen lets you grab, drag and snoop around his desk.. AJAX style. It shows that the API can also be used to pan around large images as well. Other alternative uses of the Google Maps API include: World of Warcraft Map, Perplex City Map, Middle Earth Map [Via Foundontheweb]
2006 World Series on Google Maps: Commerica Park (Detroit Tigers) & Busch Stadium (St. Louis Cardinals) - Also, if you're a Tigers fan you might enjoy this Tigers Mashup..
Run Finder - Here's a great run finder and manager tool based on Google Maps. Although this works for any world location the tool automatically centers you on the UK as a starting point. [Via ProgrammableWeb.com]
GeoDistance - Another Google Maps fitness tool that lets runners, biker, walkers, etc to calculate the distance of their route.
Wedding Map Mashup - Planning a wedding? Use this mashup to locate needed wedding professionals. Brides-to-be can also create a personal "wedding atlas" of important people and places.
Biker Mashup - GroupRider.com lets motorcyclists plot and share ride routes. Registration required.