How about everything :)!

 

  1. Integrating a Custom Snap-in Extension
  2. Developing with Resources
  3. Using Pup to Package and Unpackage Custom Resources
  4. Custom Module
  5. Web Services
  6. CS core Systems
  7. Partner SDK
  8. BizTalk Adapters
  9. Starter Site
  10. AzMan
    • The "Customization and Extensibility Virtual Lab" will show you how to extend the AzMan.