class Library
  Plugins = []
  
  def initialize#(...)
    Plugins.each do |plugin|
      # Here you can run a certain class method or grab some data from each class
    end
  end
  
  # ...
end

class LibraryPlugin
  # ...
  
  def self.inherited(sub); Library::Plugins << sub; end
end

class LibraryFooer < LibraryPlugin
  
end
class LibraryBarer < LibraryPlugin
  
end

Library::Plugins.inspect #=> [LibraryFooer, LibraryBarer]

Index: vendor/plugins/token_generator/lib/token_generator.rb
===================================================================
--- vendor/plugins/token_generator/lib/token_generator.rb       (revision 1233)
+++ vendor/plugins/token_generator/lib/token_generator.rb       (working copy)
@@ -1,7 +1,7 @@
 module TokenGenerator
   def generate_token(size = 12, &validity)
     begin
-      token = Digest::MD5.hexdigest("#{inspect}#{Time.now}").first(size)
+      token = Digest::MD5.hexdigest("#{inspect}#{Time.now}#{rand}").first(size)
     end while !validity.call(token) if block_given?
     

./script/plugin source http://svn.rails-engines.org/plugins/
./script/plugin install engines

./script/plugin source http://svn.toolbocks.com/plugins
./script/plugin install datebocks_engine