a good series of posts describing writing streaming components here…
http://blogs.objectsharp.com/cs/blogs/nbarden/archive/2008/04/01/developing-streaming-biztalk-pipeline-components.aspx
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Collection of links to BizTalk testing resources in a chm file.
It seems quite comprehensive too and even better for things you didn’t know about.
http://code.msdn.microsoft.com/BTSTestGuide/Release/ProjectReleases.aspx?ReleaseId=3786
It is created by Michael Stephenson: http://geekswithblogs.net/michaelstephenson/Default.aspx
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Benchmark your BizTalk Server (Part 1)
http://blogical.se/blogs/mikael/archive/2009/11/26/benchmark-your-biztalk-server-part-1.aspx
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The BizTalk Upgrade QuickStart includes a comprehensive set of technical content [...]