adds moving map functionality for Google Maps using a connected GPS unit

Atlanta, Boston, JFK, LA, and Chicago so far

Find pubs in London by location, tube or postcode using Google Maps

is a free Microsoft MapPoint plugin that imports and exports data to GPX formatted files

create, share, and tag your own Google Map w/o resorting to the Google Maps API.

A large set of geographical maps conveying & visualising different unusual data sources, such as suicide rates, counties, area codes, animal densities, time zones, railroads, map projections & so on.

rough-around-the-edges Google Maps/Weather mashup