Comparison of Microsoft Data Access Technologies

Deciding which data access strategy to choose is not always an easy job. Here's a compilation of articles that discuss this topic -

• This Infosys whitepaper presents a SWOT (Strengths, Weaknesses, Opportunities, Threats) analysis of ADO.NET, LINQ, Entity Framework & WCF Data Services. There is also a comparison of Entity Framework & NHibernate. Excerpt - ADO.NET offers best performance amongst its peers (LINQ to SQL, Entity Framework, WCF Data Services) 
• C# guru, John Skeet's post in StackOverlow on the pros and cons of LINQ 

(work in progress..)