Seam is the newest JSF based framework in town and this presentation by Peter Hilton and Pete Muir explained the shortcomings of existing JSF frameworks and ways to overcome these problems with Seam.
Seam promises tight integration with other frameworks/specs including:
- EJB
- Hibernate
- jBPM (java business process management)
- Richfaces
- Drools (rules engine)
It also offers Eclipse IDE support with the JBoss tools plugin.