What are the differences and pros and cons of these ORM tools/technologies?

Duplicate:

• http://stackoverflow.com/questions/66156/whose-data-access-layer-do-you-use-for-net
• http://stackoverflow.com/questions/380620/what-object-mapper-solution-would-you-recommend-for-net-closed
• http://stackoverflow.com/questions/217655/using-entity-framework-entities-as-business-objects
• http://stackoverflow.com/questions/146087/best-performing-orm-for-net

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I'm new to Object Relational Mapping (ORM) and my question is: what are the differences and the pros and cons of each of the following tools/technologies:

• Linq to Sql
• NHibernate
• Subsonic
• ADO.NET Entity Framework

From stackoverflow

• There's some good coverage on this topic on Stack Overflow, although maybe not as much on Entity Framework, but it is covered some in the third link.

  Whose Data Access Layer do you use for .NET?

  What object mapper solution would you recommend for .NET?

  Using Entity Framework entities as business objects?