The WordPress NoFollow Plugin adds rel="nofollow" to links in comments to remove their Google ranking. While I personally find it a shame that links in comments are generally not followed, thus removing the useful opportunity for smaller blogs to promote their own through active discussion in other blogs. Okay, in the end it's not that bad, but somehow a small piece of the "one link washes the other" mentality of blogs is lost... A small handicap is that the author has directly linked the plugin and unfortunately his server executes the PHP directly. At the moment, you can't download it, you only get an empty HTML page.