aoringo12

Automatically set the tag of the article.
<h3>Arbitrary section 1</h3>

aoringo TAG upper

jfoucher

This plugin uses the yahoo.com API to find the most relevant keywords from the content of your post, and then adds them as tags.
The tagging is fully automatic, so if you’re using a plugin like feedwordpress to display RSS feeds on your blog as posts, everything will get done as the feed posts are published. No user intervention necessary!

Auto-tags

Automatically add relevant tags to new posts.

aoringo TAG upper vs Auto-tags