Finding a little extra time on my hands, I decided to start adding tags to my entire backlog of posts, for handy browsing.
It turns out to be more vexing than I expected and after an hour and a half, I started to slip up. There are probably at least a few errors and for now the tags are incomplete and won't cover every post.
Also if anyone knows anything about calling back accidentally deleted posts from over a year ago, let me know. Changing an incorrect label led to at least one wholesale zap.