This plugin gives you the ability to set Meta Keywords in WordPress. Under pages it will registrate a separate taxonomy for keywords.
This plugin will make it possible to use tags as
meta keywords. Under
Pages you will find a new meta box called
By activation the plugin registrates a separate taxonomy which is independent from post tags.
Today's search engines don't use
meta keywords as a criteria at all, but who knows for what they will be good in future ;)
For me tagging is necessary to bring pages in relation and gives me the possibility to save my tags redundant in the database.
Note: Before installing or upgrading new plugins, please backup your database first!