OpenLayers
This will eventually be a module similar to GMap, but using OpenLayers as its mapping frontend.
Right now it doesn't do much of anything, but it should start becoming useful shortly.
Why another mapping module?
Well, OpenLayers has much more powerful layering and editing features than Google Maps does, and works with a wide variety of data sources, including Google Maps.
It is not as pretty, but it has a lot of functionality built in.