Recommendation for tagging

I tried to install acts_as_taggable plugin.
  $ script/plugin install acts_as_taggable
But the plugin was not found.
  Plugin not found: ["acts_as_taggable"]

Is there any recommendation for other approaches for tagging
functionality?

Thank you.

You could give acts_as_taggable_on a shot http://www.intridea.com/tags/acts_as_taggable_on

Best.
Mike

What are you using? InstantRails ofrWhat?