Config: adicionar configuracao a classe, permitindo configurar globalmente atraves da classe e localmente atraves da instancia.
Dependency Injection: github Pimple, twittee
Iterator Helpers
Reflection Helpers
Converters: toArray, toXml, toJson, toDom
Dirty: verificar se o model foi modificado, quais propriedades e quais foram as alteracoes
Hashie: https://github.com/intridea/hashie
Resource Controller

http://css.dzone.com/articles/closure-object-binding-php-54
https://gist.github.com/1121233
https://gist.github.com/1405324
http://www.xpertdeveloper.com/2011/11/trait-in-php/
http://css.dzone.com/articles/playing-new-php54-features