Automatically Tag Your Posts With WP Calais Archive Tagger
I am one of those people who are completely clueless on how to tag my posts. This plugin could really save me:
The plugin uses the Open Calais API to perform semantic analysis of your post text and suggest tags. If a post already contains a suggested tag, that tag isn’t added, but other new tags found are. It takes about 5 minutes to tag 200 posts.