While working with an EventEnvelope setup i was looking for way put ANY xml into BizTalk.
And ofc. Richard Seroter has made a marvelouse blog on the topic 
http://seroter.wordpress.com/2009/06/16/four-ways-to-accept-any-xml-data-into-biztalk-web-services/
Michael Høtoft
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BizTalk Server