I'm trying to use a droplist in a master to navigate across pages.  Each item in the droplist links to a different page.  

I can fairly easily attach behaviors to navigate to the right page, but the displayed value in the list doesn't update when I change pages.

Suggestions?

You're almost there.

Before you actually send the user to the next page, set a variable value to the selected option in the droplist.

Then, in your master that contains the droplist, create an OnPageLoad action that sets the menu to the value of the variable.

Jeff