Pretty cool presentation/talk on WSE 2.0 Hard Core Messaging by Keith Ballinger on MSDN-TV.

Messaging -- SOAP doesn't discriminate, but developers do. SOAP promised to bridge the religious gap between traditional RPC-style coding and document oriented messaging. With Web Services Enhancements (WSE) 2.0, the Microsoft platform now supports both styles of SOAP messaging, RPC request/response and sync/async messaging

[ScottW's ASP.NET WebLog]