MSDN Magazine has published Achieve Flexible Data Modeling With The Entity Framework, which talks about the ADO.NET Entity Framework starting from the initial motivation, then the different layers that make up the stack (including a nice if smallish diagram), and some of the options for moving data across layers. And of course ADO.NET Data Services is mentioned in that last section.
The article will be particularly useful for folks approaching the Entity Framework for the first time, as it does a very good job at explaining the bigger picture. It's easy for us folks that have been tracking this for some time to forget that to a large audience this is all new, and it's great to have this kind of content coming up.
As usual, remember you can post questions at the ADO.NET Data Services (Pre-Release) forum and the ADO.NET Entity Framework and LINQ to Entities (Pre-release) forum