1. MSDN Webcast: Getting up to speed with BizTalk Server 2004 for the Visual Studio .NET Developer
  1. MSDN Webcast: BizTalk Server 2004 Orchestration for the Visual Studio .NET Developer
  1. MSDN Webcast: BizTalk Server 2004 Architecture
  1. MSDN Webcast: BizTalk Server 2004 Performance and Early Adopter Experiences
  1. MSDN Webcast: Using Web Services with BizTalk Server 2004
  1. MSDN Webcast: BizTalk Server 2004 Business Rules for the Visual Studio .NET Developer
  1. MSDN Webcast:  Integrating BizTalk Server 2004 with SharePoint
  1. MSDN Webcast: Extending Mainframe Applications using BizTalk Server 2004 and Host Integration 2004

Sorry looks like the technology doesn't support off-line. Still if you are working on BizTalk Server 2004 these are worth your time investment in my opinion ;).