Find a Date
This application lets you find a date via the Google Earth Browser plug-in. The map queries Google Base for location based personal ads and uses the Google App Engine as the server to do the queries.
It works best on the west coast of North America, where apparently a lot of personal ads sites put their data into Google Base. There is even a blog post explaining how the application was developed.
The map may not be safe for work as some of the ads may contain revealing photographs.