On my Discover page you'll find helpfull tutorials I have discovered.

 

Youtube video's: BizTalk Server 2010 developer training kit

When I was searching for a more visual representation of how BizTalk works, I've stumbled across a tutorial series on youtube that was very usefull to me.

 

Technet Virtual Labs
 
A very helpfull, hands on approach of learning, well, anything is to do it yourself. Microsoft Technet Virtual Labs lets you discover BizTalk in a virtual environments for testing Microsoft's newest products and technologies. Guided, hands-on labs that you can complete in 90 minutes or less. There is no complex setup or installation
required to use TechNet Virtual Labs, you can start right away.