Parece que em breve o Resin será certificado para o JavaEE 6 Web Profile.
Fontes:
http://blog.caucho.com/?p=384
http://www.caucho.com/resin/changes/resin-4.0.2.xtp
http://www.caucho.com/resin/changes/resin-4.0.1.xtp
http://www.infoq.com/news/2010/02/resin_java_ee6_web_profiles