I had started tagging my blog posts and via a system recommended by FreshBlog, I was using those tags as a categorization method via del.icio.us. The system was somewhat automated by a GreaseMonkey script.
Sadly, the new 1.5 version of Firefox breaks the script. FreshBlog lists an alternative system but I haven’t had time to figure it out.
I could manually code the tags and keep the system going but I don’t have time for that either.