Here’s a quick presentation by Scott Woodgate who I saw at TechEd 2004 a couple of times.
http://msdn.microsoft.com/msdntv/episode.aspx?xml=episodes/en/20040812biztalksw/manifest.xml
Don’t be put off by the casual chatty intro, after 21 seconds it goes to a demonstration in Visual Studio which is very hands on. Roughly 10 minutes, it explains how to include a WSE 2.0 web service in BizTalk 2004.
BizTalk Server 2004 and WSE 2.0
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