My favorite WS-* is WS-I, a bunch of guidelines about which versions/subsets of the other standards to use, if you actually want to talk to someone else.
(As someone who once had to implement a SOAP server supporting diverse clients, I'll never pass up a chance to get a dig in)
(As someone who once had to implement a SOAP server supporting diverse clients, I'll never pass up a chance to get a dig in)