From: Marc Heiler <shevegen@...>
Date: 2007-11-16T12:39:14+09:00
Subject: Re: Module vs Class

In general I would recommend to use module if you ever want 
functionality to be spread to multiple classes, i.e. audio conversion, 
set of constants and so on.

Modules are also used as namespace shields:

  module Foo
    class Bar
    end
  end

  Foo::Bar.new
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