Every time I talk about ADO.NET Data Services, I mention that they can be consumed by any API that allows you to make http requests. I usually show how you can use the Add Service Reference feature of Visual Studio to generate proxy classes to make it simple to interact with the data service. Finally, I mention that Java and PHP toolkits exist to accomplish similar levels of developer productivity. However, I don’t think I have ever put links to those toolkits in any of my presentations. Here they are:
SharePoint 2010 exposes lists as an ADO.NET Data Service. Therefore, you can use these toolkits to interact with SharePoint!