BizTalk Samples
Simple Simon Says...
Lots of BizTalk Server 2006 samples designed and built by the BizTalk Server product team. These code samples were designed in response to input from BizTalk Server developers, and they are updated regularly with new content based on the top requests Microsoft receives, so check back often to see what's new.
Lots of lovely samples can be found here:
http://msdn.microsoft.com/biztalk/downloads/samples/
Also if you have your own request then they'd love to hear about it!