I´ve a project with 3 modules, two jar (JPA, EJB) and one war. Where I must put the components.xml, the seam.properties and ejb-jar.xml (with the interceptor-class tag)?
components.xml, pages.xml, and faces-config.xml go in your war's WEB-INF directory. The ejb-jar-xml goes in your war's META-INF directory. The seam.properties files needs to go into the module that has the seam component class files.
See the Seam examples ... provides a good overview.