this is a known bug in JBoss AS 6 M3, see https://jira.jboss.org/browse/JBAS-8024 and http://community.jboss.org/thread/150664. The bug will be fixed in M4. Till then you can try JBoss 5.1 with JSF2 ( http://community.jboss.org/wiki/upgradejbossastojsf2).
Wow, i had completely missed that issue on the jira, thanks a lot for the help Pavol, i installed JBoss 6.0 M2 and it's kinda working. Now i'm getting the following error with my tags "Tag Library supports namespace: http://richfaces.org/rich, but no tag was defined for name tabPanel"; i don't know if it's because of the limitations that RF333 has with JSF2 but i'm looking into it now.
Thanks again for your kind help