The plugin performs semantic analysis of your posts to suggest tags using Open Calais.
With the Calais Auto Tagger plugin, you’ll never have to think of tags for your posts again. The plugin uses the Open Calais API to perform semantic analysis of your post text and suggest tags for you. Add them to your post with just a click.
To obtan a Calais API key:
You should receive the key immediately.
Calais Auto Tagger adds a box to your post writing and editing screens with a “Tag Suggestions” button. Once you’ve written your post, click the button and Calais Auto Tagger will analyze your post content and suggest a list of tags. Click the plus icon next to a tag to add it to your post’s tags.