Top 11 Ways to Light Up Your Windows Vista Apps

This MSDN article Top 10 Ways to Light Up Your Windows Vista Apps helps ISVs get the most bang out of their development efforts in supporting Windows Vista; walking you through "10 Ways to Light Up Your Windows VISTA Apps".  But I think that it's not complete without  - 11. Design for Extensibility with VSTA  - for which we wait with great anticipation!  :-)  Here's a preview from the article

Top 10 Ways to Light Up Your Windows Vista Apps

1. Follow the Windows Vista style guidelines
2. Enrich the user experience
3. Enable users to visualize, organize, and search
4. Run securely
5. Design for reliability and manageability
6. Establish a customer feedback loop
7. Build for connected systems
8. Bring data to the user with RSS
9. Make document data accessible
10. Build for mobility

11. Design for Extensibility with VSTA  -- has yet to be added.  We'll be patient :-).

In the mean time, you may wish to look at some basic design for extensibility guidelines for WinFX and .Net

WinFX, WCF, Introduction to Extensibility (Empty Stub)

.NET Framework Developer's Guide Designing for Extensibility

Designing for exstensibility has the desireable side-effect of improving, even simplifying your application's overall architecture.