Update: Marquex has written a plugin that takes care of all this without having to touch PHP. Check it out: Custom sidebar WordPress plugin

I’m going to show you (you, being the wordpress theme developer or modifier) how to add elements to your blog that will change based on which page you are on. A great example of this is changing which button is on for your navigation to indicate which section is currently active. I will also show you how to get multiple widgetized sidebars rocking for your theme. I’m going to make the assumption that you already know what wordpress pages are and how wordpress can act as a cms. I will also assume you know how to widgetize your theme. Onwards. Read more…