Of all the features that I've added to my homebrew blogging software tagging (or folksonomys) has been my favorite. Here's why:

Tag Clouds

I've designed the home page of my blog to make it easy for a first time visitor to know what my blog is about.

Jeffery Zeldman proclaims that tag clouds are the new mullets. However, as I'm sure you're aware some people just can't resist the mullet.