How to Use Tags

I like the suggested rules

>Use as few tags as possible.

>Limit yourself to a self-defined set of tags.

>Tags within your set must not overlap.

>By convention, tags are in plural.

>Tags are lower-case.

>Tags are single words.

>Keep tags on a general level.

>Omit tags that are obvious.

Now if only user supplied tags could be of such a high quality. You could probably put in place rules to help up that quality on the input side.