I've installed this plug in in no time an configured it. The plugin comes with .txt file for black listed keywords so PR doesn't fall due to irrelative keywords. It generated KW for all my articles in a glance.
The developer was really supporting and responded to all my questions on the same day. Keep it up.
If you really seeking better SEO rankings, you should have this plugin, it does what YOU have to do for a very low price.