Not so long ago, I had posts with tons of tags each, and no two of them shared a tag (alright, that's exaggerated, but still, it's partly true and that's bad enough).
I just cleaned up my tags. I am now using tags as they should be used, so readers can find related posts.
Anyway, I have an important post that is going to bury this one again, so I am not going to spend too much time on this one. Just be sure to read my important (=next) post!