I discovered that I've been using tags for a while now to spark my interest in articles, I just didn't know what they were called. Technorati really does help to tame the wilderness of blogging. I am still a little nervous about sharing my blogs with the world, so I won't be registering and tagging my site. This feels a lot lke "being published" and indexed.
I could see using the directory to help narrow down areas of interest that you like to refer to often.