Freecovers is a service that maintains a large, fast and easy to use CD/DVD cover archive. Freecovers also provides a RESTful API to allow developers to easily integrate Freecovers content with their site. The Freecovers API gives developers full freedom in how they use the Freecovers content they retrieve. The API is a great way to add that extra something to your site.
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There are no mashups, developers or code associated with this API yet.
Though it doesn't say so on the api page of freecovers.net, this api has been discontinued. Could be good to know before writing code to work with it.