Tip #1:
Do you have a form with multiple instances of the same dropdown list?  Or multiple forms with the same dropdown?  Well, instead of embedding the choices inside the dropdown itself , consider saving them to an external XML file and saving it as a resource of the form(s).  It is less work and easier to maintain, especially across multiple forms.

There are a more tips coming soon. I'll get the simple stuff out of the way first and then move on to more interesting functionality. That way we won't loose any of the beginners on the way.