Why use strong named assemblies?

Question

What are the advantages of using strong named assemblies?

What are the things that can\'t be done with a normal assembly?

Answer 1

Just an example: I would like to give an answer doing more emphasis in the security. In the case we create assemblies with a source code that we don't want to be re-used for a third party but we want it to be testable, we can strongly sign an assembly and make the internals visible for only those assemblies with the same signature.