this is the beginning of a comprehensive list of guidelines...details to come

1. Reduce or Eliminate Global Variables
2. Use Object Detection Over Browser Detection
3. NameSpace your Functions
4. Use Object Literal Notation
5. Write Unobtrusive JavaScript
6. Practice Graceful Degradation and Progressive Enhancement
7. Make Use of DOM Helper Functions
8. Create an Event Plan
9. Handle Errors Properly
10. Use Singleton Classes for Utility Functions
11. Use Factory Design Patterns for Widgets
12. Reduce Code Through Inheritance
13. Use the Prototype Property