http://msdn.microsoft.com/webservices/understanding/specs/default.aspx?pull=/library/en-us/dnglobspec/html/wsrmspecindex.asp

Updated WSRM (added, among other things, CreateSequence element, negative acknowledgements and SOAP1.1-1.2 fault bindings) and a brand new whitepaper, exceptionally clear. Ta dah :-) Go get it!!