I just updated from CVS when restarting my application on AS 4.0.5 I get
Caused by: java.lang.NoSuchMethodException: org.apache.myfaces.application.ApplicationImpl.getELResolver() at java.lang.Class.getMethod(Class.java:1605) at org.jboss.seam.jsf.SeamApplication.<init>(SeamApplication.java:52) at org.jboss.seam.jsf.SeamApplicationFactory.getApplication(SeamApplicationFactory.java:19) at org.apache.myfaces.config.FacesConfigurator.configureApplication(FacesConfigurator.java:439)
Yes, Seam CVS targets JBoss AS 4.2 which comes with JSF 1.2 (the RI is the only impl of this currently)