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Ingo and Clemens are talking about sealed classes today. I'm not going to talk about that. :)

Instead, I'll share the coolest thing I learned about the sealed keyword. It works on virtual methods just like sealing classes. For instance, if you have a class:

public class Foo
{
  protected virtual void Baz() { ... }
}

You can override and seal in a derived class:

public class Bar : Foo
{
  protected override sealed void Baz() { ... }
}

This lets you end the chain of virtual override. Classes that derive from Bar are no longer allowed to override the Baz() method.