Cut Category Clutter and Toggle Visibility
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Photo by *Micky* Categories are very easy to set up in a blog. So easy in fact, that we can often get carried away and end up with dozens of categories, all clogging up space in our sidebars. Rather than deleting these categories, we can remove the clutter by linking the categories into groups.
We then show only the group titles in the sidebar, and when a group title is clicked, the list of categories in that group expands beneath it. You can see a demo here.
This solution is very easy to implement, will remove the clutter for the vast majority of your users. For your users, and search engines, who have disabled Javascript, the complete list of categories will be shown as normal (And for the code junkies, it’s also XHTML valid!)