Paul Wilson has announced version 4.0 of his awesome O/R mapper.

Update: WilsonORMapper v4.0.0.0 (5/26/2005) includes the following:

• Supports "shared inheritance" in the database using type discriminator.
• This is also referred to as "single table with type discriminator".
• Always supported "redundant inheritance" or "one table per concrete type".
• Added support for .NET v2.0 Generics and Nullable Types -- VS 2005 Beta.
• Allows you to initialize you own relation collections, as long as IList.
• Works for all new objects, as well as non-lazy cases for existing objects.
• QueryHelper GetExpression expanded with ComparisonOperators by Paul Welter.
• Also includes nearly complete OPath engine (Longhorn Specs) by Jeff Lanning.
• Added ExecuteScalar and GetDataSet methods to the Transaction class.
• Added defaultNamespace for types that do not include the Namespace.
• Breaking Change: ExecuteCommand/Update/Delete returns int (not bool).
• Bug Fixes: Enum support, ObjectSet indexer, two types with the same name.
• Bug Fixes: Exceptions and Parameter are now marked Serializable also.
• And a special thanks to Jeff Lanning for help with both OPath and Generics.