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:
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.