Recently I tried to do some binding of data in a table view to Core Data entities, and found the experience extremely pleasant. Start to finish took me 18 minutes.
I've been following the development of C# 3.5 (or whatever-the-heck it will be called) as well as the Entity Framework for a while now. It looks as though this CTP finally integrates all the useful bits.
This post will compare and contrast LINQ to SQL and LINQ to Entities provided by ADO.NET vNext, giving some information on the situations in which each technology shines and where they don't.
This post will compare and contrast the features of just using raw DLinq and SQLmetal-generated classes with the ADO.NET Entity Framework. I'll also show how the two can work together