Yesterday on the interoperability blog it was announced that Noelios Technologies is shipping a new version of the Restlet open source project (a lightweight REST framework for Java) that includes an extension for ADO.NET Data Services.
This is the second interoperability project over the last month or so which leverages data services. Prior to this, the interoperability team announced the release of a PHP toolkit for data services.
For a complete list of interoperability bridges available (which target data services and other technologies), check out this URL: http://www.interoperabilitybridges.com/
ADO.NET Data Services, Program Manager