This page lists feature requests for the Google Maps API. If you like a feature and it’s already listed, you can write your name next to it to. If it’s not listed you can append it to the list.
There are a few very interesting feature requests.
‘Compatibility with other map APIs’. This is the feature request the article at the Geonames weblog talks about. Indeed it would be very nice if there’s a common API which is shared between all the Map vendors. There can be different reasons why you want to switch between different maps, eg the license changes, the area your application is about is covered better in a different map, etc. One problem I can think of with this approach is the that the feature set is not the same for every Map. So this common API can only cover the basics, but maybe that’s enough?
If you want a common API right away you have to take a look at projects like myMap, or Mapstraction. These projects are adding an extra layer on top of the major Map APIs from Google, Microsoft and Yahoo. You could also use the Open Layers API which also supports the APIs of these vendors.
Another nice feature request is ‘Ability to restrict geocoder to a particular region, country’. If this would be possible and your application is about a specific region you even could create an auto completion search on addresses.
If you’re using the Google Maps API a lot, take a look at the list and add your name or feature request to it.