You probably need to include the commons-annotations jar, since I didn't spot it in the list.
I haven't had problems in my JSF 2.0 projects, but I've had spotty results using this annotation in my JSF 1.x projects. I think the server may need some configuration in order to get the classloader to process the annotation properly.
Also, you need to know that if you're using Tomcat6, it should be release 6.0.18 or later, as there were bugs relating to inheritance of annotations in earlier versions. Specifically, inherited annotations weren't being processed.
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subject: @PostConstruct Method Not Called In JSF 2.0