This topic has grown so tall that I had to split it into several substopics. You can find them in the table below.  The suggested reading is in-order.

[What's wrong] [IPersistentObject] [IPersistentMediumWriter] [Sample Writer] [Composable writers] [Graphical writer] [iPersistentMediumReader] [CopyObject] [Serialization in .NET]

Subitems :

[What's wrong]
[IPersistentObject]
[IPersistentMediumWriter]
[Sample Writer]
[Composable writers]
[Graphical writer]
[iPersistentMediumReader]
[CopyObject]
[Serialization in .NET]