The WS-BusinessActivity specification was published today.  This has been awhile in coming (Secure, Reliable, Transacted Web Services: Architecture and Composition refered to WS-BA last September).  But one of the cooler things about our publication is that Felipe et al published a kick ass article explaining how all these WS-Transaction specs fit together and the differences between them.  Suggested reading for those wanting to stay on top of the future of Web services.