This is cool:
"With SQL Server Yukon, you could do the following:
[sourcecode language='sql']
CREATE TABLE [dbo].[Person] (
[Id] [int] IDENTITY (1, 1) NOT NULL ,
[Person] [Person] NOT NULL
) ON [PRIMARY]
[/sourcecode]
The Person type is a .NET class. Columns in Yukon can be typed to custom .NET classes."