Just for causality i have found this great training content on msdn code.
There are a lot of information in different formats (Documents, web casts, ppts,code)
For a list of resources you better have a look at: "BizTalk 2009 Light and Easy Webcast Series” http://code.msdn.microsoft.com/bts09/Release/ProjectReleases.aspx?ReleaseId=3086
i would pay special attention on:
- Orchestration Performance – Alan Smith
- BizTalk – Creating Value to the Developer series by Zeeshan Shan