Here are some of the articles on List Boxes and Combo Boxes. At the top of each article you will see which collection (gold, silver or bronze) the article belongs to.
Let me check my list…
Tricks With Combo Boxes
Drilling with Combo Boxes
Creating Paired Listbox Controls, Part 1 and Part 2
Use Classes to Enhance List and Combo Boxes
Your Listbox-Filling Options
Get More From Your List Boxes
Tip: The IN Crowd
The full collections and related download files can be purchased here.