Entity Spaces will become the successor to dOOdads. These are (will be in the case of Entity Spaces) .NET architectures and provide a data access layer to allow developers to interact (add, update, delete records) with any database system (Access, SQL Server, Oracle, Firebird) without needing to code for the underlying database (i.e. SQL Parameters). With these you can change your database backend without needing to change all your code (except the data access classes, which can be generated via a simply UI).
Follow the progress in Mike Griffin's Blog.
Edit (27 Sep 04): blog link update