If you're getting ready to get create a map mashup, but you can't quite decide on which mapping API to use, you may want to check out Mapstraction. Mapstraction is described as:
At present Mapstraction provides support for APIs from the following nine providers:
- FreeEarth (experimental support)
Check out our Mapstraction Profile for background on the API. You can check out all of the features that are available via the Mapstraction API documentation and there's also a Wiki with additional information.
Some other things to note:
- Mapstraction is open source, and there is an SVN repository if you wish to contribute to the project.
- Mapstraction is used as part of the popular GeoPress WordPress Plugin.
- There is a new provider coverage map that shows map coverage by country.