Be aware that while .NET and Java support SOAP fairly well for historical reason it’s no picnic to use from less mainstream environments.
So while a .NET/Java developer can expose/consume a SOAP interface with a click of a button (it was heavily pushed by WS-* tool vendors after all) developers for other environments may have to work a bit harder - i.e. possibly having to learn the relevant parts of SOAP/WSDL and sling XML accordingly.
