Links to articles on Interoperability
Philosophical Split Hurts Web Services Adoption: http://www.mcdonaldbradley.com/news/articles/2003/dev_channel_mike_daconta.pdf
To infinity and beyond - the quest for SOAP interoperability: http://www.intertwingly.net/stories/2002/02/01/toInfinityAndBeyondTheQuestForSoapInteroperability.html
The Wondrous Curse of Interoperability: http://www.iseran.com/Steve/papers/interop/