A scratch of the "Entity How-To" is availlable here http://businesslayer.blogspot.com/2006/10/entity-how-to.html
The previous release was mapping the SQL TinyInt type as a VB.NET Integer type, but it's incorrect because TinyInt has to be mapped as VB.NET Byte.
The first bug, about an error in the Write method called on a new instance, has been closed!
Just a little If in the Insert method of RecodBase class.
The SqlParameter doesn't accept a Nothing value, instead of it we have to use System.DbNull.Value. If the value of a property in the Hashtable in the entity is Nothing, the value of the SqlParameter has to be System.DbNull.Value.
The home page of the project has just been released ad http://businesslayer.blogspot.com .
As soon as possible I'll publish the roadmap and the documents!